Chicken Fajita Casserole {Dump-and-Bake}

All the bold, zesty flavor of chicken fajitas, baked into one easy dish with uncooked rice, colorful bell peppers, and melty cheddar cheese. You don’t even need to pre-cook the rice or the vegetables. Stir everything together, cover it tightly, and the oven does the rest. With just 10 minutes of prep, it’s the perfect solution for busy weeknights when dinner needs to come together fast.

Before You Get Started

A few tips to make sure this casserole turns out perfectly the first time:

• Use long-grain white rice only. This recipe is specifically designed around uncooked long-grain white rice. Brown rice, instant rice, and cauliflower rice all have different liquid ratios and cook times, and substituting any of them will throw off the whole dish.
• Cover the dish tightly. A snug foil seal is what lets the rice cook through in the oven. Press the edges down firmly before it goes in. If steam escapes, you’ll end up with crunchy, undercooked rice.
• Fluff with a fork, not a spoon. When the casserole comes out of the oven, use a fork to fluff the rice gently. Stirring with a spoon compacts the grains and makes the texture gummy and dense.

How to Make Chicken Fajita Casserole

This casserole couldn’t be more straightforward. Everything goes into one baking dish, and you won’t have any extra pots or pans to clean up at the end.

Step 1: Choose Your Chicken

You’ll need about 2 cups of pre-cooked, shredded chicken for this recipe. If you prefer to start with raw chicken, you can use 1 lb. of boneless, skinless chicken breasts or thighs diced into bite-sized pieces.

⇢ Rotisserie chicken is the easiest. Pick one up at the grocery store, shred the meat, and you’re ready to go. Leftover grilled or baked chicken works just as well. You can also quickly boil boneless, skinless chicken breasts or thighs (about 15-20 minutes), or even use canned chicken in a pinch.

Step 2: Mix the Base

Preheat the oven to 375°F and grease a 9 x 13-inch baking dish well. This helps prevent the rice from sticking to the bottom as it bakes. 

Add the water, enchilada sauce, fajita seasoning, and salt directly to the dish and whisk until combined.

⇢ Control the heat here. Mild enchilada sauce keeps things family-friendly. Hot sauce or a spicier enchilada variety will give the casserole more kick, so adjust to your preference.

Step 3: Add the Remaining Ingredients

Stir in the uncooked rice, diced tomatoes (with their juices), bell peppers, onion, shredded chicken, and 1 cup of the shredded cheese. 

Use your hands or a large spoon to distribute everything evenly. The rice especially needs to be spread out so it cooks at the same rate throughout.

Step 4: Cover and Bake

Cover the dish tightly with foil and bake for 55 to 60 minutes, until the rice is tender and most of the liquid has been absorbed. 

Glass and ceramic baking dishes will take a little longer than metal pans. The best way to check: taste a bite of the rice. When it’s soft and cooked through, it’s done.

⇢ Don’t rush it. Pulling the casserole too early leaves crunchy rice. Leaving it in too long makes the rice mushy. Keep an eye on it in the last 10 minutes.

Step 5: Add the Cheese and Finish

Remove the foil and use a fork to gently fluff the rice. Sprinkle the remaining cup of shredded cheese over the top and place the dish under the broiler for 2 to 3 minutes, just until the cheese is melted and bubbling.

⇢ Cheese options. Sharp cheddar gives you a bold, classic flavor. A shredded Mexican blend (Monterey Jack, cheddar, queso, asadero) melts a little smoother and adds a milder, creamier finish. Pepper Jack is great if you want extra heat.

Garnish with cilantro, sliced green onions, or a squeeze of lime and serve right away.

Recipe Variations

A few easy ways to make this casserole your own:

• Swap the tomatoes. Regular diced tomatoes work fine if petite diced isn’t on hand.
• Change the cheese. A shredded Mexican blend or Pepper Jack both work well in place of sharp cheddar.
• No fajita seasoning? Taco seasoning is a one-to-one substitute.
• Make it heartier. Stir in a can of drained and rinsed black beans or pinto beans before baking.
• Cooking for a smaller group? Cut the ingredients in half and bake in an 8-inch square dish. The timing stays the same.

Serving Suggestions

This casserole is a full meal on its own, with chicken, rice, and veggies all in one dish. If you want to round things out, set up a simple topping bar with sour cream, diced avocado, homemade guacamole, salsa or queso, chopped cilantro, and lime wedges. 

For sides, any of these are a great fit:

• Ranch Style Beans or seasoned black beans
• Corn and Black Bean Salad
• Mexican Cornbread
• Flour or corn tortillas for scooping

I’m always leery about recipes like this, but I was astonished how tasty this is! This is an absolute keeper in my cooking repertoire. Definitely going to try other “dump-n-bake” recipes. Thanks so much!

– Kurt

Storage & Make-Ahead Tips

Refrigerator: This casserole is best enjoyed straight from the oven. Leftovers keep in an airtight container for 3 to 4 days. The rice will dry out a bit as it sits, so add a small splash of water or broth when reheating.

Reheating: Cover and warm in a 350°F oven for 20 to 25 minutes, or reheat individual portions in the microwave for about 1 minute on high.

Freezer: Freezing is not recommended. Rice tends to become mushy and grainy after thawing, so this one is best made fresh.

Make-Ahead: You can assemble the casserole a few hours ahead or refrigerate it overnight before baking. The rice will start absorbing liquid as it sits, so watch the baking time closely and check it a few minutes early to avoid overcooking.

Frequently Asked Questions

Can I use uncooked chicken in this casserole?

This recipe requires pre-cooked chicken. Rotisserie chicken is the easiest option, but leftover baked or grilled chicken, quickly boiled chicken, or even canned chicken all work well. If you’d like to start with raw chicken, you’ll need 1 lb. of boneless, skinless chicken thighs or breasts diced into bite-sized pieces. It should be done by the time the rice is tender.

What kind of cheese works best for chicken fajita casserole?

Sharp cheddar gives you a bold, classic flavor that stands up well to the fajita seasoning. A shredded Mexican cheese blend (Monterey Jack, cheddar, asadero, queso) is a great option if you want something that melts a little smoother. Pepper Jack adds heat and a creamy melt, making it a good choice if your family likes spice.

More Mexican-Inspired Casseroles

• 4-Can Mexican Chicken Casserole
• Dump-and-Bake Chicken Taco Casserole
• Chicken Enchilada Casserole with Sour Cream
• Easy Chicken Enchilada Casserole