This Chicken Fajita Casserole brings the flavors of sizzling chicken fajitas together with rice and a layer of melted cheese. Tender chicken strips, sweet bell peppers, and onions are seasoned and sautéed, then combined with rice and baked until the top is golden and bubbly.
It’s a colorful, satisfying dinner that’s easy to portion and share. Prepare the chicken and vegetables in a skillet, stir them into cooked rice, and let the oven bring everything together. Serve it as is, or add your favorite fajita toppings at the table.
Prep time: 20 minutes
Cook time: 25 minutes
Total time: About 45 minutes
Servings: 6
Why You’ll Love This Recipe
- A complete dinner in one dish: Chicken, rice, peppers, and cheese make a filling meal.
- Big fajita flavor: Seasoning, garlic, onion, and peppers give the casserole a familiar Tex-Mex taste.
- Easy to customize: Adjust the heat, change the cheese, or add beans and corn.
- Good for meal prep: The casserole reheats well for lunches and busy evenings.
- Family-friendly: Keep the seasoning mild and let everyone add spicy toppings to their own serving.
Ingredients
- 1½ cups uncooked long-grain white rice
- 3 cups chicken broth or water, for cooking the rice
- 1½ pounds boneless, skinless chicken breasts, cut into strips
- 1 red bell pepper, sliced
- 1 green bell pepper, sliced
- 1 medium yellow onion, sliced
- 2 tablespoons olive oil, divided
- 2 cloves garlic, minced
- 1 packet fajita seasoning, about 1 ounce
- ½ teaspoon black pepper
- 2 cups shredded Mexican-blend or cheddar cheese, divided
- ¼ cup chopped cilantro, optional, for serving
How to Make Chicken Fajita Casserole
1. Cook the rice
Prepare the rice according to the package directions, using chicken broth or water. Once tender, fluff it with a fork and set it aside.
Using cooked rice helps the casserole bake evenly without needing extra liquid. If you have leftover rice, you can use it here; measure about 4½ cups cooked rice.
2. Prepare the oven and casserole dish
Preheat the oven to 375°F (190°C). Lightly grease a 9-by-13-inch casserole dish with cooking spray or a little olive oil.
3. Season the chicken
Place the chicken strips in a bowl. Add the fajita seasoning and black pepper, then toss until the pieces are evenly coated. If your seasoning packet is especially salty, start with part of it and add more to taste.
4. Cook the chicken and vegetables
Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the chicken in a single layer, working in batches if necessary. Cook for about 4–6 minutes, turning the pieces, until browned and cooked through. Transfer the chicken to a plate.
Add the remaining olive oil to the skillet. Add the sliced peppers and onion and cook for 4–5 minutes, stirring occasionally, until they begin to soften but still have some texture. Stir in the minced garlic and cook for about 30 seconds.
Return the chicken to the skillet and toss everything together.
5. Combine with the rice
Add the cooked rice to the skillet or a large mixing bowl. Stir in the chicken and pepper mixture and about 1 cup of the shredded cheese. Mix until the ingredients are distributed throughout.
Taste the mixture and add more fajita seasoning or black pepper if desired.
6. Assemble the casserole
Spoon the chicken and rice mixture into the prepared casserole dish. Spread it into an even layer, then sprinkle the remaining 1 cup of cheese over the top.
7. Bake until hot and bubbly
Bake uncovered for 15–20 minutes, until the casserole is hot throughout and the cheese has melted. For a more golden top, broil for 1–2 minutes at the end, watching closely so the cheese doesn’t burn.
Let the casserole rest for about 5 minutes before serving. This helps it settle and makes it easier to scoop.
8. Garnish and serve
Sprinkle with chopped cilantro, if desired. Serve warm with salsa, sour cream, guacamole, lime wedges, or sliced jalapeños.
Tips for the Best Casserole
- Use cooked rice: The rice should be fully cooked before it goes into the casserole dish. Uncooked rice needs more liquid and a longer covered baking time.
- Cut the chicken evenly: Similar-sized strips cook at the same rate and are easy to mix with the rice.
- Avoid crowding the skillet: Cook the chicken in batches if needed so it browns instead of steaming.
- Keep the peppers slightly crisp: They’ll soften a little more in the oven, so don’t cook them until they’re completely tender in the skillet.
- Taste before baking: Fajita seasoning blends vary in salt and heat. Adjust the mixture before adding it to the casserole dish.
- Let it rest briefly: A few minutes out of the oven helps the casserole hold together when served.
Easy Variations
Make it spicy
Use hot fajita seasoning, add a pinch of cayenne, or mix sliced jalapeños into the peppers and onions.
Add black beans or corn
Stir in 1 cup of drained black beans or corn before baking for extra texture and a heartier casserole.
Change the cheese
Use Monterey Jack, pepper Jack, cheddar, or a Mexican-style blend. Pepper Jack adds extra heat, while Monterey Jack melts smoothly.
Use brown rice
Cook brown rice separately according to its package directions, then use it in place of the white rice. Brown rice is firmer and nuttier, so the finished casserole will have a slightly different texture.
Add a creamy finish
For a creamier casserole, stir in ½ cup sour cream or plain Greek yogurt with the cooked rice and chicken mixture before baking.
Use rotisserie chicken
For a shortcut, use about 4 cups of cooked, shredded rotisserie chicken. Sauté the peppers and onion, stir in the seasoning and chicken, then combine everything with the cooked rice.
Make-Ahead and Storage
To prepare ahead, cook the rice, chicken, and vegetables, then combine everything with 1 cup of cheese in the casserole dish. Cover and refrigerate for up to 24 hours. Add the remaining cheese just before baking. Because the casserole will be cold, it may need an extra 5–10 minutes in the oven.
Store leftovers covered in the refrigerator for up to 4 days. Reheat individual portions in the microwave, or warm the covered casserole in a 325°F (165°C) oven until hot throughout. Add a splash of broth before reheating if the rice seems dry.
You can also freeze the casserole before baking. Assemble it in a freezer-safe dish, wrap it tightly, and freeze for up to 2 months. Thaw overnight in the refrigerator before baking. For the best texture, add the cheese topping after thawing.
Frequently Asked Questions
Can I use leftover rice?
Yes. This recipe is a convenient way to use leftover cooked rice. Measure about 4½ cups and fluff it with a fork before mixing it with the chicken and vegetables.
Can I use chicken thighs instead of chicken breast?
Yes. Boneless, skinless chicken thighs work well and stay tender. Cut them into strips and cook them until fully done before combining with the rice.
How do I know the chicken is cooked?
The chicken should no longer be pink in the center. For a precise check, use a food thermometer and cook poultry to 165°F (74°C).
Can I make this casserole without fajita seasoning?
Yes. Use a blend of chili powder, cumin, paprika, garlic powder, onion powder, salt, and black pepper. Adjust the amounts to suit your taste.
What can I serve with Chicken Fajita Casserole?
It’s filling on its own, but it pairs well with a green salad, black beans, salsa, guacamole, or warm tortillas.
Final Thoughts
Chicken Fajita Casserole is a simple way to turn chicken, peppers, rice, and melted cheese into a hearty dinner. Sautéing the chicken and vegetables first builds flavor, while a short bake makes the top golden and bubbly. Serve it warm with your favorite fajita toppings for an easy meal everyone can customize.
