Easy chicken fajita casserole made with seasoned chicken, bell peppers, onions, and melted cheese. Perfect for quick weeknight dinners, family meals, or meal prep.

Ingredients

1 ½ pounds (680 g) boneless, skinless chicken breasts
2 tablespoons fajita seasoning
1 tablespoon vegetable oil
2 medium bell peppers, sliced into strips
1 medium yellow onion, sliced
1 ½ cups shredded cheese (cheddar, Monterey Jack, or your choice)
Fresh chopped cilantro for garnish

Instructions

Preheat the Oven: Set your oven to 400°F (200°C).
Prepare the Chicken: Place the chicken breasts in a baking dish. Drizzle with vegetable oil and sprinkle fajita seasoning evenly over the chicken. Rub the seasoning into the meat to coat thoroughly.
Add Vegetables and Cheese: Layer the sliced bell peppers and onion on top of the chicken. Sprinkle a little extra fajita seasoning and top with shredded cheese.
Bake: Place the dish in the oven uncovered and bake for 25–30 minutes, or until the chicken is fully cooked and the cheese is melted and bubbly.
Garnish and Serve: Remove from oven, garnish with fresh cilantro, and serve immediately.

Why You’ll Love This Recipe

This chicken fajita casserole brings all the bold, smoky flavors of classic fajitas into a simple, one-dish meal. It’s quick to prepare, family-friendly, and perfect for weeknight dinners or meal prep.

Tips

Use a meat thermometer to ensure chicken reaches 165°F (74°C) for safe cooking.
Slice vegetables evenly for uniform cooking.
Let the casserole rest for a few minutes after baking to help the flavors meld.
For extra flavor, sauté the peppers and onions briefly before baking.

Variations and Substitutions

Cheese: Swap cheddar for mozzarella, pepper jack, or a dairy-free alternative.
Protein: Use chicken thighs, turkey, or even firm tofu for a vegetarian twist.
Vegetables: Add zucchini, mushrooms, or corn for extra color and nutrition.
Spice Level: Increase fajita seasoning or add a pinch of chili powder for more heat.

FAQs

Can I make this ahead of time?
Yes, assemble the casserole and refrigerate for up to 24 hours before baking.

Is this recipe gluten-free?
Yes, check your fajita seasoning to ensure it’s gluten-free.

Can I freeze leftovers?
Yes, store in an airtight container for up to 3 months. Reheat in the oven or microwave.

Serving and Suggestions

Serve with warm tortillas or over rice for a complete meal.
Pair with guacamole, salsa, or sour cream for extra flavor.
Top with sliced avocado or jalapeños for added freshness and spice.
Serve with a side salad or roasted vegetables for a balanced dinner.