Fajita Chicken Breasts Casserole

Hey y'all! If you love sizzling fajitas and crave the comfort of a baked, cheesy casserole, this Fajita Chicken Breasts Casserole is about to become your new go-to dinner. It's loaded with juicy Chicken, colorful peppers, and a melty cheese topping that makes every bite irresistible. Perfect for cozy weeknights, casual gatherings, or a crowd-pleasing family meal—this dish truly hits the spot. Let's get cooking!

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Why You'll Love This

• Super easy to prep and comes together in just one pan for minimal cleanup.
• Packed with vibrant Tex-Mex flavors and melty, gooey cheese in every bite.
• Customizable—adjust the spice, cheese, or veggies to suit your taste buds.
• High-protein and naturally gluten-free for a healthier comfort food twist.
• Perfect for meal prep; leftovers taste just as amazing the next day!

Ingredients

• 4 boneless, skinless chicken breasts (about 1.5 lbs / 680g), cut in half horizontally
• 2 tablespoons olive oil
• 1 red bell pepper, thinly sliced
• 1 yellow bell pepper, thinly sliced
• 1 green bell pepper, thinly sliced
• 1 medium red onion, thinly sliced
• 2 cloves garlic, minced
• 2 teaspoons chili powder
• 1 teaspoon smoked paprika
• 1 teaspoon ground cumin
• ½ teaspoon dried oregano
• ½ teaspoon salt
• ½ teaspoon black pepper
• 1 cup shredded cheddar cheese
• 1 cup shredded Monterey Jack cheese
• ¼ cup chopped fresh cilantro (optional, for garnish)
• Fresh lime wedges (for serving)

Directions

Prep Time: 15 minutes | Cook Time: 30 minutes | Total Time: 45 minutes

Step 1: Preheat & Prepare the Chicken

1. Preheat your oven to 400°F (200°C). Grease a large 9x13-inch casserole dish with a little olive oil or nonstick spray.
2. Lay the halved chicken breasts evenly in the bottom of the dish and drizzle with 1 tablespoon olive oil.

Step 2: Season & Layer Veggies

3. In a medium bowl, combine the sliced bell peppers, red onion, garlic, chili powder, smoked paprika, cumin, oregano, salt, pepper, and the remaining tablespoon of olive oil. Toss until everything is nicely coated.
4. Evenly spread the seasoned pepper and onion mixture over the chicken breasts in the dish.

Step 3: Bake

5. Cover the casserole with foil and bake in the preheated oven for 20 minutes.
6. Remove the foil, sprinkle both cheeses evenly over the top, and return the dish to the oven (uncovered) for another 10 minutes, or until the cheese is bubbly and lightly golden and the chicken is cooked through (internal temperature should reach 165°F / 74°C).

Step 4: Garnish & Serve

7. Let the casserole stand for 5 minutes before serving. Top with cilantro and a squeeze of fresh lime juice for a burst of brightness.

Notes

• Be sure to slice the chicken breasts evenly for consistent cooking.
• Add jalapeños or a touch of cayenne if you like extra spice.
• Letting the casserole rest before serving helps the juices redistribute for maximum flavor.

Variations

• Low-Carb Version: Replace peppers with extra spinach and mushrooms for fewer carbs.
• Dairy-Free: Use your favorite non-dairy cheese shreds and a splash of olive oil instead of cheese.
• Vegetarian: Substitute thick slices of portobello mushrooms or tofu for chicken.

Required Equipment

• Cutting board and chef’s knife
• Mixing bowl
• 9x13-inch casserole dish
• Aluminum foil
• Oven mitts

Storage Instructions

• Allow leftover casserole to cool completely before storing.
• Keep in an airtight container in the fridge for up to 3 days.
• Reheat individual portions in the microwave or warm the whole casserole in a 350°F (175°C) oven for 15-20 minutes.
• Not recommended for freezing, as the veggies and cheese may become watery when thawed.

Serving Suggestions

• Serve over warm steamed rice, cauliflower rice, or wrapped in soft flour tortillas for a full Tex-Mex meal.
• Pair with a crisp green salad, spicy black beans, or roasted corn for a satisfying spread.
• Top with sour cream, guacamole, or extra salsa for added creaminess and flavor.

Pro Tips

• For extra flavor, marinate the chicken in a tablespoon of lime juice and fajita spices for 30 minutes before baking.
• Shred cheese from the block for best melting and flavor (pre-shredded can have added starches).
• If your casserole gets too much liquid, broil for 2-3 minutes at the end for a browned, bubbling top.

Frequently Asked Questions

Can I use chicken thighs instead of breasts?

Absolutely! Boneless, skinless chicken thighs work great—just adjust cooking time as needed.

How do I know when the chicken is cooked through?

The chicken is done when it reaches an internal temperature of 165°F (74°C) and juices run clear.

Can I prep this Fajita Chicken Breasts Casserole ahead of time?

Yes, you can assemble the casserole up to 24 hours ahead, cover, and refrigerate until ready to bake.

★★★★★ 4.70 from 32 ratings

Fajita Chicken Breasts Casserole

yield: 4 servings

prep: 20 mins

cook: 35 mins

total: 55 mins

A flavorful Mexican-inspired casserole made with juicy chicken breasts, fajita vegetables, and melted cheese, perfect for a hearty family dinner.

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🖨️ Print Pin Recipe

Ingredients

• 4 boneless, skinless chicken breasts
• 1 tablespoon olive oil
• 1 red bell pepper, sliced
• 1 green bell pepper, sliced
• 1 yellow onion, sliced
• 2 teaspoons fajita seasoning
• 1 cup shredded cheddar cheese
• 1 cup shredded Monterey Jack cheese
• ½ cup sour cream
• 1 teaspoon garlic powder
• Salt and black pepper, to taste

Instructions

1. 1
   Preheat the oven to 375°F (190°C). Lightly grease a 9x13-inch casserole dish.
2. 2
   Heat olive oil in a skillet over medium heat. Add sliced bell peppers and onion; sauté until softened, about 5 minutes.
3. 3
   Season chicken breasts with fajita seasoning, garlic powder, salt, and pepper. Place chicken in the prepared casserole dish.
4. 4
   Layer the sautéed peppers and onions over the chicken. Spread sour cream over the top.
5. 5
   Sprinkle cheddar and Monterey Jack cheese evenly over the casserole.
6. 6
   Bake for 30–35 minutes, until the chicken is cooked through and the cheese is bubbly and golden. Let cool slightly before serving.

CLICK FOR NUTRITION INFO ↑

Approximate Information for One Serving

Serving Size: 1 serving

Calories: 410cal

Protein: 42 gg

Fat: 23 gg

Saturated Fat: 0g

Trans Fat: 0g

Cholesterol: 0mg

Sodium: 0mg

Potassium: 0mg

Total Carbs: 9 gg

Fiber: 0g

Sugar: 0g

Net Carbs: 0g

Vitamin A: 0

Vitamin C: 0mg

Calcium: 0mg

Iron: 0mg

Nutrition Disclaimers

Number of total servings shown is approximate. Actual number of servings will depend on your preferred portion sizes.

Nutritional values shown are general guidelines and reflect information for 1 serving using the ingredients listed, not including any optional ingredients. Actual macros may vary slightly depending on specific brands and types of ingredients used.

To determine the weight of one serving, prepare the recipe as instructed. Weigh the finished recipe, then divide the weight of the finished recipe (not including the weight of the container the food is in) by the desired number of servings. Result will be the weight of one serving.

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