Name: Chicken Fajita Casserole
Prep time: 15 min
Cook time: PT-492243H30M24S
Total time: PT-492243H30M24S
Cuisine: Tex-Mex
Ingredients: 1 1/2 lbs boneless, skinless chicken breasts, sliced into strips; 1 red bell pepper, sliced; 1 yellow bell pepper, sliced; 1 green bell pepper, sliced; 1 medium onion, sliced; 2 tablespoons olive oil; 2 tablespoons fajita seasoning; 1 teaspoon garlic powder; 1 teaspoon chili powder; 1 teaspoon ground cumin; 1/2 teaspoon salt; 1/2 teaspoon black pepper; 1 (10 oz) can diced tomatoes with green chilies, drained; 1 cup shredded cheddar cheese; 1 cup shredded Monterey Jack cheese; 1 tablespoon fresh lime juice; 2 tablespoons fresh cilantro, chopped (optional)

Why You’ll Love Chicken Fajita Casserole Recipe

This recipe delivers all the vibrant Tex-Mex flavors you love in a simple, oven-baked format. It requires minimal prep, uses wholesome ingredients, and comes together in under an hour. The combination of seasoned chicken, sweet bell peppers, and gooey melted cheese makes it hearty and satisfying. It’s also versatile enough to customize based on your preferences, making it ideal for meal prep, potlucks, or casual family dinners.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

boneless, skinless chicken breasts, sliced into strips
red bell pepper, sliced
yellow bell pepper, sliced
green bell pepper, sliced
medium onion, sliced
olive oil
fajita seasoning
garlic powder
chili powder
ground cumin
salt
black pepper
diced tomatoes with green chilies, drained
shredded cheddar cheese
shredded Monterey Jack cheese
fresh lime juice
fresh cilantro, chopped (optional for garnish)

Directions

Preheat your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish.
In a large bowl, combine the sliced chicken with olive oil, fajita seasoning, garlic powder, chili powder, cumin, salt, pepper, and lime juice. Toss until evenly coated.
Add the sliced bell peppers and onion to the bowl. Mix everything together so the vegetables are coated in the seasoning.
Spread half of the chicken and vegetable mixture evenly in the prepared baking dish.
Sprinkle half of the diced tomatoes over the top, followed by half of the shredded cheeses.
Repeat the layers with the remaining chicken mixture, tomatoes, and cheese.
Cover the dish with foil and bake for 20 minutes.
Remove the foil and bake for an additional 10 to 15 minutes, or until the chicken is cooked through and the cheese is melted and bubbly.
Let the casserole rest for 5 minutes before serving. Garnish with chopped cilantro if desired.

Servings and timing

Servings: 6 servings

Prep time: 15 minutes
Cook time: 30–35 minutes
Total time: approximately 45–50 minutes

Variations
For a low-carb option, serve the casserole over cauliflower rice or enjoy it on its own.
Add cooked rice directly into the casserole before baking to make it even heartier.
Use pepper jack cheese for a spicier kick.
Substitute chicken thighs for a juicier texture.
Add black beans or corn for extra flavor and texture.
For a vegetarian version, replace the chicken with mushrooms, zucchini, and extra bell peppers.

Storage/Reheating

Store leftovers in an airtight container in the refrigerator for up to 4 days.

To freeze, place cooled portions in a freezer-safe container and store for up to 3 months. Thaw overnight in the refrigerator before reheating.

Reheat individual portions in the microwave until heated through, or warm the entire dish in the oven at 350°F (175°C) for about 15–20 minutes.

FAQs

Can I make this casserole ahead of time?

Yes, you can assemble the casserole up to 24 hours in advance and refrigerate it before baking.

Can I use pre-cooked chicken?

Yes, rotisserie or leftover cooked chicken works well. Reduce the baking time slightly since the chicken is already cooked.

How do I know when the chicken is fully cooked?

The internal temperature should reach 165°F (74°C), and the juices should run clear.

Can I make this recipe dairy-free?

Yes, simply omit the cheese or use a dairy-free cheese alternative.

What side dishes pair well with this casserole?

It pairs nicely with Spanish rice, black beans, tortillas, or a simple green salad.

Can I make this dish spicier?

Add sliced jalapeños, crushed red pepper flakes, or extra chili powder for more heat.

Is this recipe gluten-free?

It can be gluten-free if your fajita seasoning and canned tomatoes contain no added gluten ingredients.

Can I add rice directly to the casserole?

Yes, stir in cooked rice before baking to create a complete one-dish meal.

Why is my casserole watery?

Be sure to drain the diced tomatoes well and avoid overcrowding the dish with excess vegetables.

Can I use different cheeses?

Absolutely. Mozzarella, Colby Jack, or a Mexican cheese blend all work well.

Conclusion

Chicken Fajita Casserole is a simple yet flavorful dinner that transforms classic fajita ingredients into a comforting baked dish. With its vibrant vegetables, tender seasoned chicken, and melted cheese, it’s a reliable meal that’s easy to prepare and endlessly adaptable. Whether you’re feeding a family or prepping meals for the week, this casserole is sure to become a regular favorite in your kitchen.

The Best Chicken Fajita Casserole

Why You’ll Love Chicken Fajita Casserole Recipe

Ingredients

Directions

Servings and timing

Storage/Reheating