Dinner

Chicken Fajitas Casserole (Easy and Cheesy!) Recipe

ByRafael Mansero December 20, 2025December 20, 2025

Introduction

This Chicken Fajitas Casserole is an easy and cheesy dish that brings all the vibrant flavors of fajitas into a comforting baked meal. Perfect for busy weeknights, it combines tender chicken, colorful peppers, and creamy cheese for a delicious crowd-pleaser.

A black cast iron skillet filled with a cheesy dish that has an orange melted cheddar cheese layer on top. Under the cheese, you can see cooked chicken pieces and sliced bell peppers mixed with seasoning. On the cheese layer, there are chopped green onions sprinkled all over for color and freshness. In the center of the skillet, there is a small mound of avocado slices fanned out, next to a dollop of white sour cream and a spoonful of red salsa. The skillet sits on a white marbled textured surface with scattered chopped green onions and half an avocado nearby. photo taken with an iphone --ar 4:5 --v 7

Ingredients

1 tablespoon olive oil
6 boneless skinless chicken thighs or breasts (4 to 6 ounces each, cut into bite-sized pieces)
4 bell peppers (sliced; use a mix of colors for a pretty presentation)
1 small onion (sliced)
1 recipe or package fajita seasoning mix (taco seasoning can also be used)
1 cup sour cream
4 ounces cream cheese (softened)
2 cups cheddar cheese (grated)
Optional for serving: avocado, guacamole, sour cream, and salsa

Instructions

Step 1: Preheat the oven to 350 degrees F (175 degrees C). Heat olive oil in a skillet over medium heat and sauté the chicken pieces until fully cooked. Remove the chicken from the skillet and set aside.
Step 2: In the same skillet, add the sliced onions and bell peppers. Cook until they reach your desired tenderness, stirring occasionally.
Step 3: Return the chicken to the skillet with the peppers and onions. Stir in the fajita seasoning, sour cream, and softened cream cheese until everything is evenly combined.
Step 4: Transfer the mixture to a baking dish, sprinkle the grated cheddar cheese evenly on top, and bake in the preheated oven for 10 to 15 minutes, or until the cheese is melted and bubbly.

Tips & Variations

For a spicier kick, add a pinch of cayenne pepper or a chopped jalapeño when sautéing the vegetables.
Substitute Greek yogurt for sour cream to lighten up the dish without losing creaminess.
Use a blend of cheeses like Monterey Jack and mozzarella for extra gooeyness and flavor.
Add black beans or corn to the chicken mixture for more texture and nutrients.

Storage

Store any leftover casserole in an airtight container in the refrigerator for up to 3 days. Reheat in the microwave or oven until warmed through. This dish can also be frozen for up to 2 months; thaw overnight in the refrigerator before reheating.

How to Serve

A black cast iron skillet filled with a cheesy, creamy mixture with visible chunks of cooked chicken, sliced red, yellow, and green bell peppers, and melted bright orange cheddar cheese evenly covering the top. On the center, a small mound of toppings includes fanned slices of fresh green avocado, a dollop of white sour cream, and a spoonful of chunky red salsa. Sprinkled over the dish are small chopped green onions and cilantro leaves, adding a fresh green contrast. Around the skillet on a white marbled surface are a whole green bell pepper, an open jar of chunky red salsa, half an avocado with the seed removed, and stacked white flour tortillas partially visible to the side. Photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I use chicken breasts instead of thighs?

Yes, chicken breasts work well in this recipe. Just be careful not to overcook them to keep the meat tender and juicy.

Is it possible to make this recipe dairy-free?

Absolutely. You can substitute dairy-free cream cheese, sour cream alternatives, and use a dairy-free cheese to keep the dish creamy and tasty without dairy.

Rafael Mansero