Can I use chicken thighs instead of breasts?

Yes! Boneless, skinless thighs work great and often stay extra juicy. Just keep an eye on cook time and still aim for 165°F (74°C) internal temp.

What cheese works best in Fajita Chicken Breasts Casserole?

Mozzarella melts beautifully, but Pepper Jack adds a little kick, and cheddar brings more bold flavor. Monterey Jack is a great middle ground.

How do I store leftovers?

Store leftovers in an airtight container in the fridge for up to 3–4 days . Reheat in the microwave or oven until warmed through.

Can I make this ahead?

You can assemble the casserole (season chicken, add veggies, top with cheese), cover it, and refrigerate for up to 24 hours . When baking from cold, you may need a few extra minutes.

What should I serve with it?

This is where it shines: cauliflower rice , rice, tortillas, a simple salad, roasted veggies, or zucchini noodles. Basically, anything that loves fajita flavors.

5 Amazing Fajita Chicken Breasts Casserole Wins

Description

This Fajita Chicken Breasts Casserole is a quick, cheesy, flavor-packed dinner perfect for busy weeknights. Juicy chicken breasts are seasoned with bold fajita spices, baked with colorful bell peppers and onions, and topped with melty mozzarella cheese. Everything cooks together in one dish, making cleanup easy while delivering the classic Tex-Mex flavors everyone loves.

Ingredients

Scale

3–4 small chicken breasts (about 1½ lbs / 750 g), skinless and boneless
2 bell peppers (red and green), seeded and cut into strips
1 medium onion, minced
1 teaspoon cumin powder
1½ teaspoons chili powder
1 teaspoon garlic powder (or minced garlic)
2 teaspoons paprika
½ teaspoon salt
Fresh cracked black pepper, to taste
1 tablespoon vegetable oil
1 cup shredded mozzarella cheese (or pepper jack, Monterey jack, or cheddar)
Fresh chopped cilantro or parsley for garnish

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Instructions

1. Preheat the oven
Preheat your oven to 400°F (200°C) and lightly grease a baking dish.

2. Season the chicken
Place the chicken breasts on a plate and sprinkle cumin, chili powder, garlic powder, paprika, salt, and pepper on both sides. Reserve a little seasoning for the vegetables.

3. Assemble the casserole
Arrange the seasoned chicken breasts in the prepared baking dish and drizzle with vegetable oil.
Top with sliced bell peppers and minced onion. Sprinkle the remaining fajita seasoning over the vegetables.

4. Add cheese
Sprinkle shredded mozzarella evenly over the chicken and vegetables.

5. Bake
Bake the casserole for 20–30 minutes, depending on the thickness of the chicken, until fully cooked and the internal temperature reaches 165°F (74°C).

6. Optional broil
Broil for 2 minutes at the end to lightly brown the cheese.

7. Serve
Garnish with fresh cilantro or parsley and serve immediately.

Notes

Slice large chicken breasts lengthwise for faster cooking.

Pepper jack cheese adds a nice spicy kick.

Serve with cauliflower rice, regular rice, tortillas, zucchini noodles, or roasted vegetables.

Leftovers keep well in the refrigerator for 3–4 days.

Prep Time: 10 minutes
Cook Time: 25 minutes
Category: Dinner
Method: Baked
Cuisine: Mexican / Tex-Mex

Nutrition

Serving Size: 1 chicken breast portion
Calories: 320 kcal
Sugar: 3 g
Sodium: 520 mg
Fat: 14 g
Saturated Fat: 6 g
Unsaturated Fat: 7 g
Trans Fat: 0 g
Carbohydrates: 6 g
Fiber: 1 g
Protein: 42 g
Cholesterol: 120 mg