By: Jill Mills Posted: Apr 23, 2025

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This Chicken Fajita Casserole is made with seasoned chicken, sautéed peppers and onions, and rice. It’s a quick, easy dinner filled with Tex-Mex flavor. Ready in under an hour!

A spoon serving chicken fajita casserole

My family LOVES fajitas. They’re easily one of our of favorite Tex-Mex dishes and I make them pretty frequently. Air fryer steak fajitas, sheet pan fajitas, and crockpot fajitas are all on regular rotation in our house, alongside this chicken fajita casserole. This is definitely one of those dishes where everyone fights over the leftovers.

Why I Love This Chicken Fajita Casserole

Here are a few of the things I love about this casserole.

All the flavors of fajitas. This casserole is packed with all the classic chicken fajita ingredients, like peppers and onions, and fajita seasoning. So good!
Complete dinner. With rice, veggies, and chicken, this casserole is a complete meal all on its own. It’s hearty and filling but still packed with veggies.
Super easy to make. The chicken and veggies are cooked on the stovetop then everything is combined and baked to cheesy perfection.

Overhead view of ingredients needed to make chicken fajita casserole

Recipe Ingredients

This casserole is made with classic fajita ingredients, plus some extras like rice and cheese. Scroll down to the recipe card below for the exact measurements.

Chicken – I like to use seasoned chicken breast cut into bite-sized pieces. Rotisserie chicken or even canned chicken breast chunks also work.
Olive oil
Fajita seasoning – Use your favorite! The spiciest of the seasoning really determined the final spice level of the casserole.
Veggies – I like to use red, green, and yellow bell peppers for a variety of flavor and color, along with diced onion.
Sour cream – Adds some creaminess and tangy flavor.
Cream cheese – Make sure it’s softened ahead of time.
Minute Rice – Instant rice is one of my secrets to keeping this casserole quick and easy.
Chicken stock – Stick with low-sodium if possible.
Shredded cheese – Colby Jack is my go-to, but cheddar, Monterey Jack, or a Mexican cheese blend also work.
Salt & pepper

How To Make Chicken Fajita Casserole

This Tex-Mex casserole is perfect for busy weeknights! The hands-on prep is less than 30 minutes. The printable version of the instructions can be found in the recipe card below.

Prep. Preheat the oven to 375F. Toss the chicken pieces with olive oil and fajita seasoning.
Cook the chicken and veggies. Heat a tablespoon of olive oil over medium-high heat. Cook the chicken for 5-7 minutes, until browned and fully cooked. Transfer to a plate. Add the remaining olive oil and cook the diced peppers and onions for 4-6 minutes, until tender.

Chicken fajita casserole filling in a bowl

Combine the ingredients. Combine the cream cheese and sour cream in a bowl until smooth. Stir in the chicken stock, rice, a cup of cheese, the chicken, veggies, salt, and pepper. Mix until everything is combined.
Bake. Transfer the mixture to a greased baking dish. Top with a cup of cheese. Cover with aluminum foil and bake for 20 minutes. Remove the foil and bake for an additional 10-15 minutes.

A serving spoon in chicken fajita casserole

Tips & Variations

Here are a few things to keep in mind while making this chicken fajita casserole, as well as a few easy variations.

Instant rice is best. This recipe works best with instant rice. Regular rice can be used but it will need to be pre-cooked before adding it to the mixture. Also consider using cauliflower rice if you are wanting a low-carb meal.
Let rest before serving. After removing the casserole from the oven, let it rest for 5 minutes or so before serving. This gives it a chance to cool and solidify just a bit.
Try a different protein. Swap chicken breast for cooked ground turkey, ground beef, or rotisserie chicken if you prefer.
Add more veggies. Black beans, corn, and diced tomatoes are all great options for extra flavor and texture. Zucchini, mushrooms, or poblano peppers can be added to the sautéed vegetables if desired.
Adjust the heat level. To make it spicier, toss in some diced jalapeños or use a spicier fajita seasoning mix.

Overhead view of a plate of chicken fajita casserole

Serving Suggestions

This hearty chicken fajita casserole makes a great meal on its own. I’ll often add a few toppings to the table, like fresh cilantro, sour cream, diced avocado (or guacamole), and salsa (or pico de gallo).

How To Store & Reheat Leftovers

Fridge. Store leftovers in an airtight container in the refrigerator for up to 3 days.
Reheat. Reheat portions in the microwave for 1-2 minutes or in a 350°F oven until warmed through.