This Garlic Parmesan Zucchini Casserole is an easy side dish recipe that pairs beautifully with just about any family meal!
This zucchini casserole has quickly become a favorite among the boys in my house!
I'm telling you: if you want to get your kids (or your husband) to eat some green vegetables, then THIS is the recipe for you. The zucchini is mild, it's baked with three different kinds of cheese, and it's finished with a buttery Parmesan breadcrumb topping. What's not to love?!
It's cozy, it's family-friendly, and it will make your house smell ah-mazing! A "home cooked" dinner never tasted so good -- especially at the end of a busy day.
Here's What You Need to Make it
- Zucchini - grated
- Salt
- Onion - I like to use frozen diced onion as a shortcut
- Garlic - fresh and minced
- Eggs
- Parmesan cheese - freshly grated
- Mozzarella cheese - Shredded
- Cheddar cheese - Shredded
- Panko breadcrumbs
- Butter
Why You Should Salt Zucchini Before Baking
Zucchini naturally holds a lot of water so you'll probably notice as it cooks a lot of water is released. This can be a problem when adding them to casseroles, bakes, and sauces as it can water down the sauce and texture causing a bland flavor.
If you sprinkle the zucchini with salt and allow them to sit for 10 minutes the salt will draw out a lot of moisture so you won't have that problem.
TIP: In order to make sure that I get most of the water out of the zucchini (and avoid a runny casserole), I like wrap the zucchini in a dish towel. Squeeze it and wring it out multiple times while it's in the towel -- you will be shocked by how much liquid comes out!
Is This Casserole Gluten Free?
You can easily make this zucchini casserole gluten-free by using gluten-free breadcrumbs.
If you want to add a little more fiber and nutrition to the dish you could use whole wheat breadcrumbs instead of regular ones.
How to Make Garlic Parmesan Zucchini Casserole
- Place zucchini in a colander, sprinkle with salt, and allow to sit for about 10 minutes (this will help draw out some of the water from the zucchini). After 10 minutes, squeeze out moisture from the zucchini.
- In the prepared dish, combine zucchini, onion, garlic, eggs, ½ cup Parmesan cheese, mozzarella cheese, and cheddar cheese. I like to use my hands to make sure that it’s all completely combined, and then gently press the mixture evenly into the prepared dish.
Bake uncovered for 20 minutes. - Meanwhile, in a small bowl, pour melted butter over breadcrumbs and 2 tablespoons of Parmesan cheese. Stir until completely combined.
- After 20 minutes, remove zucchini from the oven. Sprinkle buttered breadcrumbs over the zucchini and return the dish to the oven.
- Continue baking for about 5-10 more minutes, or until the top is golden brown and crispy.
Can I Freeze this Casserole?
Although you can freeze this I don't recommend it since the zucchini will hold a lot of water and it will affect the texture and taste after being frozen.
Leftovers can be stored in the fridge for up to 3 days and reheated in the oven until piping hot throughout.
Cook's Tips and Recipe Variations:
- I just use a handheld box grater to shred my zucchini, but you can also put it through a food processor if you prefer.
- Make sure that you drain the zucchini before adding it to your casserole. To do so, I like to place the grated zucchini in a dish towel and squeeze it really hard to wring out all of the excess liquid.
- I've used three different types of cheese here: Parmesan, mozzarella and cheddar. You can substitute with an equal amount of any of your favorite cheeses -- or stick to just mozzarella or just cheddar.
- Garnish the dish with fresh herbs (such as chopped fresh parsley) for a bright burst of color and flavor.
What Can I Serve with This Zucchini Casserole?
This casserole would be a perfect side dish to grilled chicken, salmon or baked white fish, with sausages or served alongside a roast dinner.
The cheesy and creamy texture with fresh zucchini and a crispy butter topping will not disappoint however you choose to serve it!
Other Easy Zucchini Recipes that You Might Enjoy:
- Easy Stuffed Zucchini Boats
- Dump-and-Bake Chicken and Zucchini Noodles Casserole
- Zucchini & Parmesan Baked Omelet
- Dump-and-Bake Summer Pasta with Zucchini, Corn and Chicken
Garlic Parmesan Zucchini Casserole
Ingredients
- 4 cups grated zucchini I used about 3.5 medium zucchinis
- ½ teaspoon salt
- ½ cup finely diced onion I like to use frozen diced onion as a shortcut
- 1 tablespoon minced garlic
- 2 eggs
- ½ cup grated Parmesan cheese plus an additional 2 tablespoons
- 1 cup shredded mozzarella cheese
- ½ cup shredded cheddar cheese
- ½ cup Panko breadcrumbs
- 2 tablespoons melted butter
Instructions
- Preheat oven to 375 degrees F. Spray a small baking dish with cooking spray and set aside (I used a dish that was 8-in x 5-in, but an 8-inch square pan will also work).
- Place zucchini in a colander, sprinkle with salt, and allow to sit for about 10 minutes (this will help draw out some of the water from the zucchini). After 10 minutes, squeeze out moisture from the zucchini. TIP: In order to make sure that I get most of the water out of the zucchini (and avoid a runny casserole), I like wrap the zucchini in a dish towel. Squeeze it and wring it out multiple times while it's in the towel -- you will be shocked by how much liquid comes out!
- In the prepared dish, combine zucchini, onion, garlic, eggs, ½ cup Parmesan cheese, mozzarella cheese, and cheddar cheese. I like to use my hands to make sure that it’s all completely combined, and then gently press the mixture evenly into the prepared dish.
- Bake uncovered for 20 minutes.
- Meanwhile, in a small bowl, pour melted butter over breadcrumbs and 2 tablespoons of Parmesan cheese. Stir until completely combined.
- After 20 minutes, remove zucchini from the oven. Sprinkle buttered breadcrumbs over the zucchini and return the dish to the oven. Continue baking for about 5-10 more minutes, or until the top is golden brown and crispy.
Notes
- I just use a handheld box grater to shred my zucchini, but you can also put it through a food processor if you prefer.
- Make sure that you drain the zucchini before adding it to your casserole. To do so, I like to place the grated zucchini in a dish towel and squeeze it really hard to wring out all of the excess liquid.
- I've used three different types of cheese here: Parmesan, mozzarella and cheddar. You can substitute with an equal amount of any of your favorite cheeses -- or stick to just mozzarella or just cheddar.
- Garnish the dish with fresh herbs (such as chopped fresh parsley) for a bright burst of color and flavor.
Is this easy to make before (maybe the morning of?) and then cook later on for dinner?
Hi, Kristin! Yes, you can definitely make it ahead of time. Your best bet would be to bake it through Step 4 in advance. Then freeze or refrigerate the baked zucchini until you're ready to finish it. Then you just need to top it with the breadcrumbs and finish baking when you're ready to serve. Hope that helps! 🙂
I am allergic to eggs. What is a good alternative for me to use in this recipe??
Hi, Alicia! I'm honestly not sure. I haven't tested this recipe without the eggs, and the eggs are important for holding the casserole together. If you omit the eggs, you would want to find something else to act as a binder. I know that there are some commercially made egg replacers, which are often made with potato starch, tapioca starch and leavening. These are used in baking, but can probably be used here, too. Another option that some folks use in baking is to replace eggs with "flax eggs." Again, I haven't actually tried this, but you could see how it goes if you're curious. To replace one egg, whisk together 1 tablespoon (7 grams) of ground chia or flaxseeds with 3 tablespoons (45 grams) of water until fully absorbed and thickened.
Hope that helps!
Thanks you I may someday have to experiment with that egg substitute. Can you taste the egg in the dish, or is it just binding like as it is in a cake, where as the cake does not taste like egg.
Hi, Alicia! The flavor of the egg doesn't stand out much in this dish. It's more of a binder in this case. 🙂
I made this dish and absolutely loved it. However, I did not shred the zucchini... I cubed it. Even though I used salt, I did not get water from it. By keeping it in the oven 10 more minutes before the breadcrumbs it cooked thoroughly and it was not watery. ( the water helped cook the cubes). Then I put the breadcrumbs on and back in the oven. It was delicious!
That's a great tip, Meredith! Glad that you enjoyed it!
I have heard that the liquid from canned garbanzo beans can be substituted for eggs.
easy, delicious and a good low carb veggie dish. I added a heavy splash of hot sauce and some freshly grated nutmeg to balance all the cheese. this recipe is a keeper
Sounds perfect! Thanks, Sheba!
I really enjoyed this zucchini casserole. I was afraid that it would have an overwhelming zucchini flavor, but it didn't. Although, it did have a ton of flavor! The onions added a nice crunchy texture. And the cheese was the icing on the cake.
Yumyumyumyum!
Thanks for your note, and I'm so glad that you enjoyed it! The zucchini is very mild, isn't it? I think that's why my kids and husband love it so much. 🙂
I just want to say how delicious this dish was. I made it while visiting my daughter because she loves squash. It was a huge hit. This pin on my board is pinned repeatedly everyday. There must be lots of zucchini lovers out there!!! Thanks so much for your creativity!!!
Hi, Laurie! Thanks so much for your kind note and for letting me know. A good zucchini recipe is always helpful to have on hand -- especially in the summer. So happy that your family enjoyed it!
What can I replace the eggs with? May daughter is allergic to eggs.
Thanks,
Kimberly
Hi, Kimberly! I've never made this dish without eggs, so I'm not sure how it will work with different ingredients. That said, I do know that vegans and other folks with egg allergies often substitute regular eggs with "flax eggs." Have you used flax eggs before? To make a flax egg, just mix one tablespoon ground flaxseed meal with three tablespoons of water. Mix together, and let sit in your fridge for 15 minutes to set up and thicken. That's equivalent to one egg, so just double or triple depending on how many regular eggs you're replacing.
Thanks! I never heard of that before. I will have to buy some - thanks!!
You're welcome! 🙂
okay so I made it last night...overall I liked it. I tried the "flax egg " mixture instead of the egg like you suggested. Since I've never made this dish before I'm not sure what the consistency should be like, but I think mine was more on the wet side. I'm not sure if the zucchini wasn't drained enough or if it was the "flax egg".
I also think I put too much garlic in...I think 1 tablespoon might be too much.
My daughter (who is allergic to eggs) liked it in the beginning then said she didn't like it. But she almost finished her small bowl of it. Again, I think it was the overpowering garlic taste.
Either way I would make it again with less garlic and have her try it again!
Hi, Kimberly! I'm glad to know that it worked out overall. When it comes to draining the zucchini, I like to wrap it in a dish towel and literally wring it dry -- squeezing it as hard as I can until no more water is coming out. You would be amazed by how much moisture is released, and I think that you'll find the casserole is not watery at all if you do it this way. Hope that helps, and thanks for sharing your feedback! 🙂
I have done it with out eggs and it's delicious
Awesome! Thanks, Carrie!
Made this tonight, it is awesome, love It! Will keep this recipe for future use.
Perfect! Thanks, Karen -- I'm so glad that you enjoyed it! 🙂
I made this for supper last night and it is amazing!! A hit with the whole family! This is a keeper recipe! Thank you!!!!
I'm so glad to hear that the family enjoyed it, Cheryl! Thanks for letting me know!
I've been looking for a new dish to take to Thanksgiving dinner. This sounds like a yummy, updated version of a classic family dish!
Wonderful! Enjoy, Jen! It's one of our favorites! 🙂
Made this tonight for the first time and I really liked it. I grated 2 cloves of garlic and did find the flavor on the strong side but I like garlic, so I was ok with it. I also know grating garlic releases a stronger flavor so that might be part of it. Great recipe!!!
Thanks, Heidieh! 🙂
If planning to double the recipe, would you also double the time in oven? Very excited to try!
Hi, Kristelle! No, I wouldn't double the time in the oven. You might need to add a little bit of time to accommodate the larger dish, but probably not much. I would bake it uncovered for 25-30 minutes before adding the buttered breadcrumbs on top. Then return to the oven for the final 5-10 minutes. If that still doesn't seem long to heat it through, you can cover the top lightly with foil (to prevent the top from getting too brown) and leave it in the oven for a few more minutes, as necessary. 🙂
plan on making this in a 9x13 dish for Easter Sunday.....I was going to almost double amounts ....cooking time suggestions?
Hi, Bernie! Doubling the ingredients for a 9 x 13 dish should work perfectly. The cooking instructions should remain largely the same; although you might want to add about 5-10 minutes to the overall cooking time to make sure that it's properly heated through. Just check it after the first 20 minutes and see if the zucchini mixture looks adequately warmed through. If not, pop it back in the oven for 5 more minutes before adding breadcrumbs to the top. Hope you love it!
I made this last night for 8 guys who were working on my house. I doubled the recipe and you would have thought that it was the best thing these guys have ever eaten. It was all devoured by the end of the meal! Definitely going to make this again!
Wonderful! It's a huge WIN when a veggie dish gets the stamp of approval from a group of guys! 🙂
This recipe was wonderful, I followed the recipe exactly minus the onions and when you follow directions its comes out exactly the way it should be , no ruuny mess over here lol.
Perfect! So glad that it worked, Robin! 🙂 Thanks for your note!
I made this tonight and it was so good! My husband even commented on how great it tasted especially with so much zucchini in it. Will be making this again, as our family of 3 devoured pretty much the whole thing in one sitting. Thanks for the delicious recipe!
Wonderful! Love when the husbands approve of veggie dishes! 🙂
Can you shred the zucchini instead of grating it? It seems like it would take a very long time to grate the zucchini.
Yes, I think that would probably work fine.
Thank you, Blair!
How did shredding vs grating work out? Glad you asked as when I read grated, I assumed shredded. Agree grating would take forever!
Also wanted to make ahead but wondering if 10 minutes after adding pinko would reheat it up sufficiently.
Hey, Karen! I would think that it will likely need about 15-20 minutes to reheat completely, so maybe sprinkle on the topping towards the end.
Do you measure the zucchini before or after you squeeze it out? Kind of confused. Sounds good tho.
Measure it before squeezing it out. 🙂
I made this last night to go with grilled lamb loin chops.
I added a cup of cooked white rice to the mixture and used lowfat cheeses.
It was excellent!!! My husband ate two helpings. I will definitely make this again.
Oh, great idea to add the rice! Thanks, Nancy!
I have made this recipe 3 times already! Great stuff!
1st time) Made as recipe states and it was a hit, even with those who thought they didn't like zucchini.
2nd time) Tried being creative and tried squeezing the zucchini with a potato ricer - turns out it does NOT work as good as an old fashioned tea towel. Lesson learned.
3rd time) Went back to the original way! Having some health issues, so I reduced the cheese and added some already cooked quinoa. Eating it now and it's fabulous. Thanks so much!
Thanks, Leela! I'm so glad that you love it, too. I just made it last week and I enjoyed some leftovers for lunch the next day. It's so good that I could eat it like an entree! Love the idea of adding quinoa to make it more filling!
I have cups and cups of frozen zucchini from my garden last year. I'm trying to use it up and found your recipe. Do you think this recipe will work if I use frozen zucchini?
Hi, Monique! I think it would probably work fine, but I would definitely thaw the zucchini first and really make sure to squeeze out any excess liquid. 🙂
Thinking about adding precooked ground turkey to the dish for an all in one. Thoughts? TIA
That sounds like a delicious idea! I bet it will work really well. Let me know if you give it a try, Adair!
Oh my dammmmit! Deeeelicious! !
Hah! Thank you! 🙂
Made this using yellow squash and it was delicious. Topped it off with Frenchs onions and Frenchs Jalapeno. Gave it a nice kick. Will make again!!!
YUM! So glad that you enjoyed it, Renee!
I’ve made this three times. The last time I used yellow squash and carrots because it was what I had. Just as yummy as the first 2 times. My husband requests it.
Awesome! Thanks, Cerina!
Do you peel the zucchini?
Hi, Jana! No, you don't need to peel the zucchini. 🙂
I had a recipe for zucchini that was similar. I bakedit and cut it into squares for appetizers. It was delicious, but I can't find
the recipe. Could this be modified to do the same thing?
Hi, Sherrie! This might work, but I don't think that it will cut as neatly into squares as you might hope. These two recipes sound more like what you're looking for, so take a look and see if they're similar to your old recipe:
Zucchini Pie: https://www.theseasonedmom.com/zucchini-pie/ (just bake it in a square pan and slice into squares instead of using a round dish)
or
Cheesy Spinach Squares: https://www.theseasonedmom.com/aunt-bees-spinach-cheese-squares/ (use zucchini instead of the spinach, perhaps?)
Hope that helps!
Recipe is listed as a Weight Watcher but what are the points per serving?
Hi, Carolyn! I haven't listed the recipe as "Weight Watcher friendly," so I'm not sure where you saw that. I'm not familiar with exactly how to calculate points for Weight Watchers, so I'm not any help in that regard. Maybe you can use the nutrition panel provided below the recipe to help you calculate the points? Again, sorry that I'm not able to be more helpful! I hope that you get to try it, though -- we love this dish! 🙂
Great and simple recipe. I added a can of fire-roasted diced tomato (simply because I love zucchini and tomato together) It was wonderful.
Sounds delicious! Thanks, Amanda!
sy and turned out great. I used thawed roasted garlic I had in the freezer, doubled the recipe and used as a main dish. It came out pretty too - so I'll have another option for potlucks! Thanks for the tip to wring out the zucchini - that's always been a problem for me and zucchini!
Yay! I'm so glad to know that you've found a keeper, Johanna! Thank you for taking the time to leave a comment!
I cut the recipe in half since it was just for myself and added a cup of mixed vegetables. Love it! Used stuffing mix instead of Panko breadcrumbs. Delicious!
Sounds perfect, Ashli! Thank you!
Thankyou for this recipe! I made it as written except I added a kittle leftover Feta cheese that I had in the fridge.
Excellent dish!
Definitely will make this again, yum.
I bet the feta was delicious! Thanks so much for taking the time to leave a note. 🙂
I just made this for dinner tonight and it wasn’t a huge hit. I think the onion & garlic combo overpower the other flavors- and I think the cheese might be too much. I usually love zucchini but this wasn’t great
I made it with a few changes because of health reasons. First change was I sliced the Zucchini instead of grating it. Second I deleted the salt and 3rd I deleted both the mozzarella and the cheddar cheeses. Even though I made these changes it turned out FANTASTIC!
I did make it the second time Exactly as per the instructions. I didn't like it. It was OK, but after tasting the first one, that's all it was.
Now I friends making your Recipe (my way) with other vegetables and the love it. Thank you very much. This is one of the best things I make and can eat, happily.
That's great to hear, Bonnie! Thanks for sharing your changes and for taking the time to leave a note. 🙂
Thank you for responding.
Question:.Do you have any other Recipes that can be adapted to fit with Chronic kidney disease all stages?
Hi, Bonnie! I'm not familiar with the dietary restrictions associated with chronic kidney disease. If you can give me a few more details about what you're looking for, I might be able to direct you to some other recipes. 🙂
Thank you for responding.
Question:.Do you have any other Recipes that can be adapted to fit with Chronic kidney disease all stages?
Taste was great. Personally, I would grill the onions and garlic before adding to the recipe.
We enjoyed this casserole tonight with our dinner. I substituted white cheddar cheese for regular. This turned out perfectly cooked in our toaster convection oven. : )
That's wonderful, Nancy! Thanks for taking the time to come back here and let me know!
I was torn on how to rate this recipe. It is fantastic, but for me it's not a casserole. It's definitely an egg bake. Leaving off the crackers made a delicious keto egg breakfast. If you like garlic and eggs, this one is a winner, but it's not a casserole.
I made this several times last summer and it was always a hit. While reviewing the recipe before this year's first zucchini I thought I would drop a few comments. I usually use an extra egg because I like the casserole a little firmer. Also if I use about half the onion out of dried, chopped onions it takes on part of the zucchini moisture and makes draining/squeezing a little less critical. I'm with the folks who add hot sauce, though a small (cooks preference on amount) of chopped fresh peppers is an interesting flavor. Other additions I've found work for me: fresh basil, ham or chicken, top with feta crumbles instead of bread crumbs for gluten free. Thanks for the great recipe.
Thanks for those helpful notes, Jim! Your additions sound perfect!
WE just made this recipe at a Hosiptal kitchen, and its sooo good! we will be serving it to the whole hospital tomorrow!
That's amazing, Sophia! Thanks for your note. I hope that the hospital patients enjoy the dish. 🙂
I made this yesterday. It came out perfect. I used zucchini from our garden. Thank-you. Very gtood
I made this yesterday. It came out perfect. I used zucchini from our garden. Thank-you. Very good.
Thanks, Donna! I'm so glad that you enjoyed it! Can't beat garden-fresh zucchini. 🙂
I made this tonight with a slight change. Instead of using the mozzarella and cheddar cheeses, I used ricotta and the Parmesan. My husband is not a huge fan of cheeses so this was what we agreed on. I also used yellow squash and the zucchini. OH MY GOODNESS, so so good. I think next time I'm going to saute the onions first. They still have a slight raw taste to me (which in all fairness could be my oven). Other than that, I wouldn't change a thing. Hubs said it's definitely a keeper!!! Thank you so much for sharing your recipe!!!
I'm so glad that you both enjoyed the dish! Thanks for sharing your twist. 🙂
We loved this recipe. For getting rid of the excess moisture from the zucchini, I put it in my salad spinner and "spun" the excess moisture out after 10 minutes. It worked well.
I also cut back just a little bit on each of the cheeses to help reduce the fat content. It was still delicious. The panko bread crumbs on the top really puts it over the top. My hubby is not a fan of zucchini but he liked this so well, he suggested I make it at Thanksgiving. Who knew???
Thanks!
Yay! So glad that your husband even approved! 🙂
We loved the recipe. I used a salad spinner to get the excess moisture out of the zucchini after it sat for the 10 minutes. I also cut back just a little bit on each of the amounts of cheese mainly to help reduce the fat content of the dish. My husband who is not a fan of zucchini, really enjoyed it as well. He even suggested serving this dish at Thanksgiving this year. Who knew??
Thanks!
My hubby and the boys enjoyed this casserole. Lots of compliments. Definitely need to spend more time draining the zucchini so it won’t be squishy. Still delicious. I used the leftovers in a lunchtime wrap today.
Thanks, Maria!
Thanks, Maria! So glad that you both enjoyed it!
Thanks for sharing
Very Amazing thanks so much for Sharing.
I just made this and it is absolutely delicious! Will make again for sure!
This looks like a wonderful recipe! I'm wondering if anyone has made it with a huge overgrown zucchini? My CSA keeps delivering me huge overgrown zucchini and I don't know if any recipe will be good with zucchini this large.
Hi, Louise! I think you could definitely use an overgrown zucchini in this recipe. Just remove the really large seeds and you should be good to go!
I wish it would cool down enough here in Texas to start making these recipes, but rest assured they are printed out and are being kept safely in my Home Management Notebook, ready for that first cold snap!Vodka Cupuacu
Hopefully soon, Lisa! I know how you must feel. This is our first week of cooler days and I'm loving it...
🙂
Love this recipe it was so simple!! I used my stand mixer and the recipe worked great I made this recipe for my daughters headstart class.Oreo Mcflurry recipe
Thank you!
I came across this recipe about a month ago and excited to make it for the second time. The flavors are outstanding and if you dry the zucchini properly, you will enjoy the perfect texture between the zucchini and panko breadcrumbs. Thank you for sharing such a delicious, easy recipe!
Thanks, Amber!
Love this recipe it was so simple!! I used my stand mixer and the recipe worked great I made this recipe for my daughters headstart class.Keto Meal Prep
Probably my ever best dish, I have made it now for forty years non stop....I don ‘ t put eggs, so it is lighter ....I usually slice the courgettes very thin in the magimix...then steam them.....I always make a big amount so I can freeze it after baking...in the baking dish...and reheat it in a hot oven...love it when the rice gets crispy at the bottom.....I also add leftovers green like kale....my mum add cooked tomatoes in the mix...she likes it moist....
Cheers
Christiane
Sounds perfect, Christiane!
An easy and truly delicious recipe. I love zucchini and was glad to have a new way to prepare it. This is a perfect dish to bring to gatherings - I can’t wait! I know it will be a hit! I served it with grilled chicken sausage in a little marinara sauce and they went together wonderfully. Thank you for the great recipe!
Thank you, Christine! I'm so glad that you liked it and that you'll share it with friends and family, too. 🙂