Zesty fajita chicken with gooey mozzarella and vibrant veggies. This dish is gluten-free, low-carb, high-protein, and perfect for busy nights.

Are you tired of having the same old dinner options? I get you!

When I need something quick to make and delicious at the same time, I always rely on this fajita chicken casserole.

With its tender, juicy chicken, vibrant bell peppers, and gooey melted mozzarella, this casserole is bound to become your household favorite.

Plus, it’s gluten-free, low-carb, and easy to modify for other dietary needs or preferences.

Besides its delicious combination of flavors, this fajita chicken casserole is very easy to make. It has minimal prep time, and you just need one baking dish to make.

So, not only can you make this meal in a matter of minutes, but you won’t need to spend hours cleaning afterwards.

Whether you are hosting a get-together or need to whip up something quick for your family, this recipe has something for everyone.

Ingredients and Substitutes

Chicken breasts, skinless, boneless (4 small) – You can substitute with chicken thighs for extra juiciness or use tofu for a vegetarian spin on the recipe.

Olive oil (1 tbsp) – Swap for avocado oil or ghee.

Red bell pepper, seeded and cut into strips (1) – Yellow or orange peppers are also great additions. You can use one or a combination of all of them.

Green bell pepper, seeded and cut into strips (1) – Just like with red bell peppers, you can use other bell peppers to boost the nutrients and flavors of the dish.

Yellow onion, finely chopped (1) – Shallots or red onions are great alternatives.

Mozzarella, shredded (1 cup) – Feel free to swap this for cheddar, Monterey Jack, or a dairy-free alternative.

Fresh cilantro, chopped – If cilantro isn’t your thing, you can use fresh parsley.

FAJITA SEASONING

Cumin powder (1 tsp), chili powder (1 ½ tsp), garlic powder (2 tsp), paprika (1 tbsp), salt (1/2 tsp),  black pepper (1/4 tsp )

How to Make Fajita Chicken Casserole

Step 1. Preheat your oven to 400°F and prepare a baking dish by spraying it with oil. Grab a small bowl and add the Fajita seasoning ingredients.

Step 2. Give the spice blend a good mix.

Step 3. Cover all of the chicken breasts with most of the spice blend. I do recommend leaving some for the veggies.

Step 4. Transfer the chicken breasts to the baking dish and drizzle them with olive oil.

Step 5. Top the chicken with the bell peppers.

Step 6. Now add the onions.

Step 7. Sprinkle the rest of the Fajita seasoning.

Step 8. Now, sprinkle the delicious, shredded mozzarella on top.

Step 9. Bake for 25-30 minutes or until the chicken is fully cooked. If they are thicker, they may need a bit more cooking time.

Once you see that the chicken breasts are cooked, set the oven to broil and cook for 2 minutes to brown the cheese. Before serving, garnish with fresh cilantro.

What I Would Serve with This Fajita Chicken Casserole

• Cauliflower rice
• Zucchini noodles
• Guacamole and chips
• Green salad with a lime vinaigrette
• Rice and beans
• Warm tortillas

My Tips & Tricks

1. Don’t skimp on the seasoning: Make sure you fully coat the chicken and vegetables to ensure maximum flavor.
2. Marinate ahead of time: While it’s not mandatory, I’ve found that allowing the chicken to sit with all the spices (20-30 minutes) boosts the flavor a lot.
3. Avoid overcooking the chicken: Cooking the chicken too long can result in dry chicken. 

My Storage Tips

One of the best things about this recipe is how well it holds if you happen to have any leftovers. Place any leftovers in an airtight container and keep them in the fridge for up to 3-4 days.

You can also keep it in the freezer for up to 3 months. Just make sure you place it in a freezer-safe container.

Ready to have it again? Place it in the oven at 350°F for about 10-15 minutes or place it in the microwave at 30-second intervals.