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Easy Chicken Fajita Casserole baked with chicken, bell peppers, onions, and melted cheese in a casserole dish.

Easy Chicken Fajita Casserole Recipe

This Easy Chicken Fajita Casserole combines juicy, seasoned chicken with colorful bell peppers, onions, and melty cheese for a comforting, flavorful baked dish. It is perfect for busy weeknights or meal prep, offering a hearty one-dish meal that everyone will enjoy. The casserole delivers the classic taste of chicken fajitas in an easy-to-make, oven-baked format.
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Prep Time 30 minutes
Cook Time 40 minutes
Total Time 1 hour 10 minutes
Servings: 6
Cuisine: Mexican-American
Calories: 450
Ingredients Method Notes

Ingredients
  

  • 2 pounds boneless, skinless chicken breasts, sliced into thin strips
  • 2 tablespoons olive oil
  • 1 red bell pepper, sliced
  • 1 green bell pepper, sliced
  • 1 yellow bell pepper, sliced
  • 1 onion, thinly sliced
  • 2 teaspoons chili powder
  • 1 teaspoon ground cumin
  • 1 teaspoon smoked paprika
  • 1 teaspoon garlic powder
  • ½ teaspoon onion powder
  • ½ teaspoon salt
  • ½ teaspoon black pepper
  • 1 cup cooked rice or cooked pasta
  • 1 cup shredded cheddar cheese
  • 1 cup shredded mozzarella cheese
  • ½ cup sour cream
  • ¼ cup fresh cilantro, chopped

Method
 

  1. Preheat oven to 375°F (190°C) and lightly grease a large baking dish with olive oil.
  2. Slice chicken into thin strips and place in a large mixing bowl. Add olive oil, chili powder, cumin, smoked paprika, garlic powder, onion powder, salt, and black pepper. Toss to coat evenly.
  3. Add sliced bell peppers and onion to the bowl and mix to combine with the chicken.
  4. Transfer the chicken and vegetable mixture into the prepared baking dish. If using cooked rice or pasta, gently fold it in at this stage.
  5. Dollop the sour cream over the top and spread gently across the surface.
  6. Sprinkle shredded cheddar and mozzarella evenly over the casserole. Cover loosely with foil.
  7. Bake for twenty-five minutes, then remove foil and bake an additional ten to fifteen minutes until chicken is cooked through and cheese is golden and bubbly.
  8. Remove from oven and let rest for five minutes before serving.
  9. Garnish with chopped fresh cilantro before serving.

Notes

  • You can substitute chicken thighs for breasts for more flavor.
  • Add black beans or corn for extra texture and nutrition.
  • Serve with a side salad, warm tortillas, or guacamole for a complete meal.
  • Leftovers can be refrigerated for up to three days and reheat well.
  • This casserole can be portioned for meal prep for simple quick lunch ideas.