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Chicken Fajita Casserole

This super simple chicken fajita casserole is going to be a family favorite weeknight dinner that everyone will love!
Close up fajita casserole with avocado slices.

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Chicken Fajita Casserole is a delicious and easy weeknight meal for busy families! When you need dinner in a hurry on busy nights this easy dinner recipe will make the whole family happy and well-fed.

Chicken Fajita Casserole on a white plate with avocado and lime and a skillet of casserole.

Everything you love about fajitas is right here in this chicken fajita casserole recipe. Tender seasoned chicken, bell peppers, and onions all baked, not fried, together in the oven. Once it’s baked through you’ll top it with cheese, sour cream, and salsa and bake it again!

Gooey melted cheese on top of chicken, peppers, onions in a casserole.

Need a potluck Dish?

This is a great dish to take to a potluck, serve it with street taco-sized flour tortillas warmed in the microwave. Everyone loves chicken fajita casserole on the potluck table because it’s a filling main dish everyone loves.

A serving of fajita chicken casserole on a white plate with a fork and sliced limes.

Meal Prep this Chicken Fajitas Casserole

Next time you’re meal prepping try this recipe. Make this on the day before you have to go to work. Let it cool, and divide it between your meal prep containers. We use these Rubbermaid containers or these pyrex dishes for easy meals during the week. I work at home and even I like a pre-made lunch!

Ingredients for chicken fajitas casserole.

What do you need to make this Fajita Casserole

  • boneless skinless chicken breast
  • red or green bell peppers
  • yellow onion
  • fajita seasoning mix, something like this packet is fine
  • vegetable oil or light olive oil
  • sour cream
  • salsa
  • shredded cheddar cheese, pepper jack cheese, (Speed Hack try the pre-shredded Mexican cheese blend from Costco)
  • sliced avocado for serving
  • 9×13 baking dish, casserole dish OR 10-inch cast iron skillet or an oven-proof large skillet
  • large bowl

Chicken for this casserole

You can use chicken breasts or chicken tenderloins in this recipe. If you want you can also use boneless skinless chicken thighs. It really depends on what cut of chicken you prefer, either one will work. I don’t think leftover chicken works here in this recipe, it might get dry during baking.

Close up fajita casserole with avocado slices.

What if I don’t have Fajita Seasoning Mix?

No worries! You can sub in taco seasoning mix! Add a pinch of cumin to the taco mix if you have it to give it a little more fajita seasoning flavor.

Don’t have a packet of taco seasoning mix? make your own using pantry staples and my taco seasoning recipe. SUPER easy and very flavorful. It contains cumin, chili powder, garlic powder, onion powder, Mexican oregano, paprika, salt, and pepper.

A bite of chicken fajitas casserole on a fork.

Change up the Veggies in this Fajita casserole!

Add vegetables your family likes such as mushrooms or zucchini is a great way to customize this recipe! Or use red onion if that’s what you have and like. You can add a can of green chiles or jalapenos too, just drain them and add them to the pan.

Make this recipe your recipe!

There’s nothing wrong with swapping out the vegetables, just make sure they’ll work together and your family will eat them!

What to serve with a Fajita Chicken Casserole

  • The only thing missing from regular fajitas in this casserole is flour tortillas. You COULD warm some tortillas and serve them with the fajita casserole. More like traditional fajitas with a hands-off casserole wrapped in warm tortillas means an easy win on a busy weeknight!
  • If you don’t want to serve the casserole with tortillas you can serve it up with canned refried beans or just canned black beans.
  • Or if you have a rice cooker try this simple totally not traditional Spanish Rice in the Rice Cooker. It’s super quick and easy and makes a perfect side dish.
  • If you and your family are going low carb serve cauliflower rice. Or use a bag of flavored cauliflower rice for a quick flavorful side!
  • A quick green salad is also a nice addition to this meal. Just toss together lettuce, green onions, and tomatoes, and add any dressing you like. OR use salsa as a dressing or make this Mango Pico de Gallo!
  • Want a margarita? Check out my pairing guide for margarita flavors!

This fajita casserole

This chicken fajitas casserole is low-carb, if you need a keto chicken casserole this is your dish!! ! No grains mean low carb but remember peppers and onions and salsa DO have some carbs, so you need to research the carbs in those so you stay in range.

If you have leftovers

Store any leftovers in an airtight container in the fridge for up to 3 days. You can reheat the leftovers on the stovetop or in the microwave.

Heat the leftovers and put it on top of tortilla chips with extra cheese for fajita nachos! Or wrap the leftovers in flour tortillas.

Close up fajita casserole with avocado slices.

Chicken Fajita Casserole

5 from 61 votes
This super simple chicken fajita casserole is going to be a family favorite weeknight dinner that everyone will love!
Course: Dinner Recipes
Cuisine: Mexican Inspired
Prep Time: 10 minutes
Cook Time: 20 minutes
Servings: 6 Servings
Calories: 364kcal
Author: Laura
Print Recipe


  • 1 1/2 lbs chicken breast cubed
  • 2 bell peppers deseeded and cut into strips, use red or green peppers
  • 1 onion sliced
  • 2 Tablespoons fajita seasoning
  • 1 Tablespoon vegetable oil
  • 1 cup sour cream
  • ½ cup salsa
  • 1 ½ cups shredded cheddar cheese
  • *optional toppings chopped cilantro, chopped jalapeños, sour cream, shredded cheese, salsa or pico de gallo for serving


  • Preheat oven to 375º
  • Combine chicken, peppers, onion, fajita seasoning, and vegetable oil in a bowl and toss to coat everything in the oil and seasoning
    Mix oil, seasoning, vegetables mixed together.
  • Pour into a 9×13-inch baking dish, or 10-inch cast iron skillet, and bake in preheated oven for 20 minutes
    Cast iron skillet with fajitas in to bake in the oven.
  • While the chicken is baking, combine sour cream and salsa
    Combine salsa and sour cream.
  • Remove chicken from oven and pour sour cream mixture over chicken
    Pour sour cream mixture over the chicken fajita mix.
  • Stir to combine
    Stir the sour cream mix into the fajita skillet.
  • Top with cheese
    Cheese sprinkled on top of the fajita casserole.
  • Place back in the oven for 10 more minutes, until cheese is melted and beginning to look toasty
    Gooey melted cheese on top of chicken, peppers, onions in a casserole.
  • Remove from oven and serve with sliced avocado, and your choice of optional toppings cilantro, chopped jalapeños, extra salsa, extra sour cream, or extra shredded cheese
    Close up fajita casserole with avocado slices.


Serving: 1serving | Calories: 364kcal | Carbohydrates: 8g | Protein: 32g | Fat: 22g | Saturated Fat: 10g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 5g | Trans Fat: 0.03g | Cholesterol: 123mg | Sodium: 473mg | Potassium: 656mg | Fiber: 2g | Sugar: 5g | Vitamin A: 1902IU | Vitamin C: 54mg | Calcium: 257mg | Iron: 1mg
Chicken fajita enchilada casserole served on a white plate.
laura sampson

About Laura

Laura is on a mission to teach modern family oriented women how to make old-fashioned foods new again. A wife and mom of 3 boys, Laura understands the struggles of trying to serve a home-cooked meal each night. She provides recipes and cooking hacks for busy moms to create dishes they may think take more time or skill than they have to make. Read more...

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