This baked apple oatmeal is a hearty breakfast casserole with grated apples, warm cinnamon, and crisp caramelized edges. Everything stirs together in one bowl in about 10 minutes! Bake a pan on Sunday and breakfast is handled all week.
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Before You Get Started
Baked oatmeal is forgiving, but a few choices really do decide how the pan turns out. Here is what matters most:
- Grate the apples, skin on. The shreds melt into the custard and keep the whole pan moist. No peeling required.
- Use quick oats, not rolled. Quick oats soften into that soft texture that we associate with Amish baked oatmeal. Rolled oats work but bake up noticeably chewier.
- Use whole or 2% milk. The custard needs some fat to set properly and taste rich instead of watery.
- Check early with dark pans. Metal, dark, and cast iron dishes bake faster than glass or ceramic. Start checking around 35 minutes.
The Best Apples for Baked Oatmeal
Almost any apple works here, but the variety you choose changes the finished texture more than you would expect. It comes down to whether you want to see the apples or not.
- Firm and tart apples hold their shape. Granny Smith, Honeycrisp, Braeburn, and Jonagold stay intact through the bake, so you get distinct pockets of apple in every bite. These work well if you want to peel and dice them (instead of grating).
- Softer, sweeter apples melt in. Gala, Fuji, and McIntosh break down into the oats, which makes the whole pan sweeter and more uniform.
I reach for Honey Crisp most often because it offers a great blend of sweet and tart flavor, with a slightly firm texture. If you came home with a mix from the orchard, use them together. One tart and one sweet gives you the best flavor.
How to Make Baked Apple Oatmeal
Baked oatmeal is a traditional Amish breakfast casserole. Unlike stovetop oatmeal porridge, it is stirred together and baked in a casserole dish, which gives it a consistency closer to bread pudding with crunchy, caramelized edges and a moist, soft center. Here is how it comes together:
Step 1: Whisk the Wet Ingredients
Whisk the melted butter, eggs, and brown sugar together in a large bowl until smooth. Make sure the butter has cooled a bit first. If it is still hot off the stove it can start to cook the eggs.
Step 2: Stir in Everything Else
Add the quick oats, baking powder, cinnamon, salt, milk, and grated apples, then stir until no dry oats remain. The mixture should look loose and wet at this stage. The oats absorb most of that liquid in the oven.
⇢ Want chunkier apples? Peel and dice them small instead of grating. You will get distinct bites of apple rather than shreds that melt in.
Step 3: Transfer to the Pan
Grease a 9 x 13-inch baking dish and spread the mixture into an even layer. Even thickness matters more than it seems, since thin spots can dry out before the center sets.
⇢ Cooking for one or two? Halve everything and bake in an 8-inch square pan for 35 to 40 minutes. A reader even makes hers in a toaster oven.
Step 4: Bake Until Set
Bake at 350°F for 40 to 45 minutes. The oatmeal should be lightly browned at the edges and across the top, and a knife inserted in the center should come out mostly clean with a few wet crumbs clinging to it. If it looks jiggly or wet in the middle, give it another 5 minutes.
⇢ Look for set and dry, not jiggly. This is the single most common place people pull the pan too early.
Step 5: Slice and Top
Cut into squares and serve warm. A splash of warm milk poured over the top is the classic way to eat it, with a drizzle of maple syrup or a spoonful of my Crockpot Apple Butter for extra flavor.
If you have apples left over, my Baked Apple Slices spoon right over the top!
What to Serve Alongside
On a regular weekday morning this is a full breakfast on its own, especially with a scoop of yogurt on the side to add a little staying power. For a weekend or a holiday spread, it plays the same role as coffee cake: it is the sweet main, so pair it with something salty and something fresh.
Eggs and a pork dish are the two easiest additions, and a bowl of fruit keeps the table from feeling heavy. A few that work well:
Storage, Freezing and Reheating
This is the part that makes baked oatmeal worth the pan. Bake it once and you have breakfast for most of the week.
To store: Baked oatmeal needs to go in the refrigerator or freezer. Wrapped tightly, it keeps in the fridge for 3 to 4 days.
To freeze: Bake as directed, cool completely, then wrap tightly and freeze for up to 1 month. Wrap individual squares so you can pull out one at a time.
To make ahead: Bake the night before, cool, cover, and refrigerate. Let it sit on the counter while the oven heats the next morning.
To reheat: Warm a full pan in a 350°F oven for 15 to 20 minutes. For a single square, microwave it covered with a splash of milk for 45 seconds to a minute. The milk keeps it from drying out.
⇢ Week Make-Ahead Tip: Bake Sunday afternoon, and Monday through Thursday breakfast is a 60-second reheat with whatever toppings are on hand.
Frequently Asked Questions
Can I use old-fashioned oats instead of quick oats?
Yes, and the recipe still works. The texture just changes. Quick oats give you the soft, tender casserole that most people picture when they think of Amish baked oatmeal, while old-fashioned rolled oats bake up chewier with more distinct oats in every bite.
Do not substitute steel cut oats. They will not soften enough in the bake time.
Can I dice the apples instead of grating them?
Absolutely. Grating is what I prefer because the shreds disappear into the custard and keep the whole pan moist without any peeling. If you want apples you can actually see and bite into, peel them and dice them small. Readers have done it both ways with good results.
Can I use less brown sugar?
You can cut it back to about ¾ cup without much trouble. Below that you will notice two things: the pan browns less at the edges, and the oatmeal tastes noticeably plainer. If you would rather not reduce it in the batter, leave the sugar as written and skip the sweet toppings, or serve it with plain yogurt instead of syrup.
Can I make this with non-dairy milk?
Yes. Almond, oat, soy, and coconut milk all work here, and readers have had good luck with almond milk in particular. Choose an unsweetened variety if you can, since the sweetened ones will make the whole dish sweeter than intended.
Did you make this recipe?
If you enjoyed this recipe, please leave a comment with a 5-star review at the bottom of the post. Thank you!
Baked Apple Oatmeal
Ingredients
- ½ cup (1 stick) salted butter, melted and cooled
- 2 large eggs, beaten
- 1 cup packed light brown sugar
- 3 cups quick oats ("instant oats")
- 2 teaspoons baking powder
- 1 teaspoon ground cinnamon
- 1 teaspoon kosher salt
- 1 cup milk (I use 2%)
- 2 medium apples, grated (you do not need to peel them)
- For serving: warm milk or cream, brown sugar, butter, maple syrup, nuts, fresh fruit
Instructions
- Preheat oven to 350°F. Grease a 9 x 13-inch baking dish and set aside.
- Whisk together the melted butter, eggs, and brown sugar in a large bowl until smooth.
- Add the oats, baking powder, cinnamon, salt, milk, and grated apples. Stir until no dry oats remain. The mixture will look loose and wet.
- Transfer to the prepared baking dish and spread into an even layer.
- Bake for 40 to 45 minutes, until lightly browned at the edges and set in the center. A knife inserted in the middle should come out mostly clean with a few wet crumbs.
- Slice into squares and serve warm with milk and other toppings.
Notes
- Apple choice matters. Firm apples like Granny Smith, Honeycrisp, Braeburn, and Jonagold hold their shape. Softer apples like Gala and Fuji melt into the oats.
- Grating versus dicing. Grated apple (skin on) melts in and adds moisture. For visible chunks of apple, peel and dice small instead.
- Oat swap. Old-fashioned rolled oats work but bake up chewier. Do not use steel cut oats.
- Use whole or 2% milk for the best texture. Almond, oat, soy, and coconut milk also work. Choose unsweetened.
- Pan type changes the timing. Metal, dark, and cast iron pans bake faster than glass or ceramic. Start checking at 35 minutes.
- For a smaller batch, halve all ingredients and bake in an 8-inch square pan for 35 to 40 minutes.
- Salt note. Between the salted butter and the full teaspoon of salt, this is well seasoned so that it’s not too bland. Scale back to ¾ teaspoon if you are sensitive to sodium.
- Storage. Refrigerate up to 4 days or freeze up to 1 month. Reheat with a splash of milk so it does not dry out.
Nutrition
Originally published in September, 2020, this post was updated in October, 2026.
Can you use regular oatmeal not instant?
Hi, Kathleen! Yes — you can. It won’t have the same soft texture (it will be chewier), but the recipe will work. Enjoy!
Looks engaging and delicious. I want to practice immediately. I like your pages very much. This recipe changes the way use oat before. Pouring honey on the top and sprinkle cashew or walnut debris look very attractive.
Absolutely delicious. Little that I did have leftover I froze. Heated up in toaster oven and fabulous. The flavors are so well blended together. A true BREAKFAST TREAT!
Thanks, Maureen! I’m so glad that you enjoyed it! 🙂
I have made baked oatmeal a few times, sometimes with apples and sometimes with pumpkin. But I never grated the apples. I use stevia and possibly a little honey and almond milk because of yeast syndromwe. But I like Amish food.
My first try at a baked oatmeal, so I was nervous but it is sooo good! Thank you! I followed your suggestion about diced fruit instead of shredded – I used 1 granny Smith apple and because I had some peaches canned in juice, I drained and diced the equivalent of the apple. The only other change I made was reducing the sodium a bit. I used half salted butter and half unsalted, then added a little less than a teaspoon of Morton Lite Salt. I just ate this for lunch – without any toppings at all – and was delicious!
I’m so glad to hear that, Clothos! It’s on my agenda for the week ahead, too. Such a great fall meal!
Wow. I’m honestly not much of a cook anymore but a few times a year I need a good breakfast casserole. This is so easy and so good. I stuck to the original recipe with the exception of almond milk in place of cows milk. I can see how versatile this dish can be and will experiment with other ingredients. I cut the recipe in half and was able to cook in the toaster oven which makes it super easy when you only need enough for one or two people
We’re so glad it turned out well for you, Gail! Thank you for trying it out and taking a time to leave a review. We’d love to hear about any variations you come up with.
This is a great recipe, taste better than others i have had that just use applesauce. I love the consistency of it, and yes delish with milk and syrup, we had it for our dessert tonight and will eat in the morning
Thank you, Tina! We’re so glad you enjoyed it!