If you’re a fan of bold Tex-Mex flavors and crave a quick dinner solution with minimal cleanup, then this Chicken Fajita Casserole will become your new go-to weeknight meal. It’s all the sizzling excitement of fajitas—without the hassle of cooking everything separately on the stovetop. Packed with juicy chicken, colorful bell peppers, onions, melted cheese, and a zesty seasoning blend, this dish turns fajitas into a satisfying baked casserole that’s both family-friendly and meal-prep approved.
Why You’ll Love This Chicken Fajita Casserole
One-dish simplicity: Everything bakes together, making cleanup a breeze.
Low-carb & keto-friendly: Ditch the tortillas and keep the flavor.
Customizable: Add rice, beans, or keep it veggie-heavy — it’s easy to adapt.
Make-ahead: Perfect for prepping ahead of busy weekdays.
Ingredients You’ll Need
2 lbs boneless, skinless chicken breasts (cut into thin strips)
1 red bell pepper, sliced
1 green bell pepper, sliced
1 yellow bell pepper, sliced
1 medium red onion, sliced
2 tablespoons olive oil
1 tablespoon fajita seasoning (store-bought or homemade)
1 teaspoon garlic powder
1 teaspoon chili powder
Salt and pepper to taste
1 ½ cups shredded cheddar cheese
1 cup shredded Monterey Jack cheese
Optional toppings: sour cream, chopped cilantro, avocado, lime wedges
How to Make Chicken Fajita Casserole
1. Preheat the Oven
Preheat your oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish.
2. Prepare the Ingredients
In a large mixing bowl, toss the chicken strips, sliced peppers, and onion with olive oil, fajita seasoning, garlic powder, chili powder, salt, and pepper.
3. Assemble the Casserole
Spread the seasoned chicken and vegetables evenly in the prepared baking dish. Top with shredded cheddar and Monterey Jack cheese.
4. Bake
Cover with foil and bake for 25 minutes. Remove the foil and continue baking for another 10–15 minutes or until the chicken is cooked through and the cheese is bubbly and golden.
5. Garnish and Serve
Let it rest for 5 minutes. Garnish with your favorite toppings like sour cream, fresh cilantro, or avocado slices. Serve as-is, over rice, or with a side of tortilla chips or low-carb tortillas.
Tips and Variations
Make it creamy: Add a dollop of cream cheese or sour cream before baking for a creamier texture.
Add beans or corn: Black beans or corn kernels can be mixed in before baking for a heartier version.
Spice it up: Add jalapeños or a pinch of cayenne if you prefer more heat.
Meal prep tip: Store in airtight containers for up to 4 days. Reheat in the microwave or oven.
What to Serve With Chicken Fajita Casserole
Pair this dish with:
Cilantro lime rice
Cauliflower rice (for low-carb)
A crisp green salad
Cornbread or tortilla chips
Sliced avocados or a dollop of guacamole
Easy Chicken Parmesan Casserole Recipe
FAQ: Chicken Fajita Casserole
Q: Can I use rotisserie chicken instead of raw chicken?
A: Absolutely! Just mix the pre-cooked shredded rotisserie chicken with the seasonings and veggies. Reduce bake time to about 20 minutes since the chicken is already cooked.
Q: Can I freeze this casserole?
A: Yes, this casserole freezes well. Cool it completely, cover tightly with plastic wrap and foil, and freeze for up to 3 months. Thaw overnight in the fridge and reheat in the oven.
Q: Is this recipe keto-friendly?
A: Yes! It’s naturally low in carbs. Just make sure your fajita seasoning doesn’t contain added sugars or starches.
Q: What’s the best cheese for this casserole?
A: A blend of cheddar and Monterey Jack provides the best melt and flavor. You can also use pepper jack for a spicier version.
Q: Can I make it vegetarian?
A: Sure! Substitute chicken with sliced mushrooms or tofu, and bulk it up with more veggies or beans.
This Chicken Fajita Casserole delivers all the flavor of traditional fajitas, minus the work. It’s a delicious and versatile recipe that’s sure to earn a permanent spot in your dinner rotation. Whether you’re feeding a hungry family or prepping for the week, this casserole is a stress-free, flavor-packed solution.