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Home » Recipes » Chicken

Easy Chicken Fajita Casserole Recipe

Modified: Mar 20, 2025 by Kori Butler · Published: Jan 19, 2024

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If you're craving bold fajita flavors with the ease of a single baked dish, this chicken fajita casserole is your new go-to! Made with just 8 ingredients—including juicy chicken, bell peppers, onions, fajita seasoning, sour cream, and two cheeses—this high-protein, low-carb casserole is cheesy, creamy, and packed with flavor.

Chicken fajita casserole baked in a large cast iron skillet.Pin
Jump to:
  • The backstory.
  • The must-make chicken fajita casserole recipe!
  • What you'll need.
  • Make it yours.
  • How to make chicken fajita casserole.
  • How to serve fajita chicken casserole.
  • Kori's tips.
  • FAQs
  • 📖 The recipe.
  • Keep the good eats going.
  • 💬 What readers are saying.

The backstory.

I did it again. I forgot the tortillas.

I swear, every time I make anything remotely enchilada, taco, or fajita-related, I get all excited about the sizzling chicken, the melty cheese, the creamy goodness… and then, as I’m about to start making dinner, it hits me—I forgot the tortillas. Again.

I know you've heard this story before, at this point, it’s practically tradition. But honestly? This chicken fajita casserole is so ridiculously good that nobody even misses them.

xoxo Kori

One reader says:

This chicken fajita casserole recipe is easy and so delicious!! My whole family loved it. Thanks! 😍 - Shannon, Pinterest

The must-make chicken fajita casserole recipe!

Classic fajita flavor - but it's a casserole. This chicken casserole recipe brings the sizzling flavors of a classic fajita into a cheesy, baked dish. No tortillas required (but you can totally add them if you want!).

Quick and easy (one-pan meal)! From stovetop to oven, this fajita chicken casserole comes together in just one skillet (with only 8 ingredients)—which means fewer dishes for you!

It's a healthy chicken fajita casserole! This casserole is high in protein, gluten free (if you use my fajita seasoning recipe), low carb, keto-friendly, and has no added sugar.

  • To lower the fat content: use chicken breasts instead of thighs, lowering the quantity of cheese used, and substituting a lower-fat cream cheese and sour cream.

What you'll need.

Ingredients needed for making chicken fajita casserole on a white wooden board.

Here are the ingredients you will need to make this easy chicken fajita casserole:

  • Olive Oil
  • Chicken Thighs - boneless skinless thighs, but you can also use chicken breast too!
  • Bell Peppers - use any favorite color. I love using different colors.
  • Yellow Onion - While I used a yellow onion, you could also use a sweet, white, or red onion.
  • Homemade Fajita Seasoning Recipe or Copycat Taco Seasoning Mix Recipe - you can use either fajita seasoning mix or taco seasoning. I highly recommend you make your own seasoning mix - it's easy, inexpensive, and much healthier than store-bought.
  • Sour Cream
  • Cream Cheese
  • Shredded Cheddar Cheese - use mild or sharp shredded cheese - whichever you prefer. Substitute pepper jack cheese if you it spicy!
  • Optional for Serving: avocado slices, shredded cheese, guacamole, fresh cilantro, or salsa. Don't forget hot sauce for the spicy lovers! 🙂

For exact ingredient quantities, please see the recipe card below!

Make it yours.

  • Make it lighter: Swap boneless chicken thighs for boneless chicken breasts to reduce fat, or use Greek yogurt instead of sour cream for extra protein.
  • Either taco seasoning or fajita seasoning can be used - use what you have on hand.
  • Make this steak fajitas by using sliced sirloin steak, or a shrimp version by using large shrimp (tails removed).
  • Cheese swaps: Love spice? Use pepper jack instead of cheddar. Want it extra gooey? Try Monterey Jack or a Mexican cheese blend.
  • Dairy-free option: Use a plant-based sour cream and dairy-free cheese to make this lactose-free.
  • Spice it up: Add diced jalapeños or a pinch of cayenne for extra heat.

How to make chicken fajita casserole.

You will be pleasantly surprised at how easy this chicken casserole recipe is to make! Here is an overview, for complete details, please see the printable recipe card below. Enjoy!

Making chicken fajita casserole and cooking the chicken in a cast iron skillet.Pin

Cook the chicken

In an ovenproof skillet saute chicken until done. Remove from pan and keep warm

Sauteeing the onions and bell peppers for chicken fajita casserole.Pin

Cook the veg

Saute onions and peppers until tender.

Adding the chicken fajita casserole seasoning to the cooked chicken and peppers.Pin

Mix

Add chicken back to the pan. Stir in cheddar cheese, sour cream, and seasoning.

Topping the chicken fajita casserole with shredded cheddar cheese before baking.Pin

Sprinkle and bake

Sprinkle the top with the shredded cheddar cheese and bake in the oven until cheese is melted.

How do you cut chicken breast for chicken fajitas?

  • The most common way is to cut the chicken breast into thin ½" strips sliced horizontally, cutting against the grain. 
  • Keep in mind that the smaller the pieces, the quicker they will cook so you may need to shorten your cooking time as recommended by the recipe instructions.

How to serve fajita chicken casserole.

Chicken fajita casserole in a cast iron skillet with sour cream and avocado slices.Pin

Need ideas on how to serve this chicken fajitas casserole? Here are some tasty options:

  • My favorite toppings for this dish is salsa and sour cream.
  • Serve as-is for a low-carb, keto-friendly meal.
  • Not low carb or keto? No problem! This chicken casserole recipe can be served with tortillas, rice, or beans for a meal the whole family will enjoy.
  • Spoon over cauliflower rice for a light, grain-free option.
  • Wrap in low-carb tortillas or classic flour/corn tortillas for a more traditional fajita-style meal.
  • Add a fresh side salad with cilantro lime avocado dressing for a refreshing contrast.

Toppings to Try: Extra shredded cheese, salsa, chipotle crema, roasted chili corn salsa, or hot sauce for a spicy kick!

Love a good fajita? Be sure to try this Chicken Fajita Soup that can be made in your Instant Pot, crockpot, or on the stove. I also have this Instant Pot Chicken Fajitas recipe with delicious Mexican-style rice. Enjoy!

Kori's tips.

  • Don’t overbake—Since most of the recipe is cooked, you only need to bake the casserole to get the cheese bubbly and heat the inside. No more, no less. Technically, you don't even have to bake this casserole, but you won't have that nice ooey gooey melted cheese on top!
  • Cut chicken into uniform pieces for even cooking.(approx 1" to 2" in size, or you can do 1½" strips if you prefer)
  • Cook the onions and peppers to your desired tenderness. Some people love them crisp-tender; others love them completely soft. 
  • Cook the chicken to 165º - the safe internal cooking temperature.
  • If you don't have an oven-proof skillet, just cook chicken, peppers, and onion according to the recipe. Stir in the dairy. Put the mixture into a casserole dish, then top with shredded cheddar cheese and bake. 

FAQs

What temperature should chicken be cooked to?

The USDA recommends that chicken should be cooked to 165º degrees. I always check the temperature of my chicken with an instant read thermometer. Here is a link to their Safe Minimum Internal Temperature Chart.

Are chicken fajitas healthy for you?

Chicken fajitas are very healthy! With plenty of nutrients, healthy fat, protein, and fiber you will feel satisfied long after your meal is over. 

Amazingly, each serving of this chicken fajita bake (keto low carb) has over 100% of your day's vitamin C, 35% Vitamin A, 30% zinc, 23% calcium, and is loaded with Vitamin B's!  48% Vitamin B12, 45% Vitamin B6, 44% Vitamin B3, 41% Riboflavin B2. 

Where are all these vitamins coming from? Well, the fats are coming from the chicken, olive oil, cheese, and sour cream. The calcium is mostly coming from the cheese and sour cream, but the bulk of the remaining B's, Vitamin A , and Zinc, are coming from the peppers. 

Here's a super interesting article about peppers from WebMD:
Pepper Power: Nutrition and Other Benefits

How many carbs are in fajitas without tortillas?

Fajitas without tortillas and contains approximately 10 grams of carbs per 1 cup serving.

How to store fajita chicken casserole

Store any leftover fajita casserole in an airtight container up to 3 days. This recipe does not freeze well as the peppers become very watery and the dairy often separates.

Can you freeze chicken fajita casserole?

Sorry, you cannot freeze this casserole as the peppers will turn watery and the fats in the dairy will separate.

📌 Pin this pin to Pinterest for later!

Baked chicken fajita casserole Pinterest pin.Pin

Can I ask you a favor?

If you tried this recipe, let me know! I'd love for you to come back and give the recipe a 5 star rating and leave a review in the comments! 🙂 Let's stay connected, so please follow me on Instagram, Facebook, and Pinterest! Subscribe to my newsletter to get healthy fresh recipe ideas every week!

📖 The recipe.

Baked chicken fajita casserole in a cast iron skillet with slices of avocado, sour cream, salsa, and fresh cilantro.

Chicken Fajitas Casserole (easy and cheesy!)

This chicken fajita casserole recipe is a super delicious and EASY Mexican recipe - full of all your favorite fajita flavors, but in a cheesy casserole. Yum. Only 8 ingredients and one pan from stovetop to oven. A family favorite!!
4.62 from 414 votes
Print Recipe Pin Recipe Save Saved!
Author Kori Butler
Prep Time 10 minutes mins
Cook Time 35 minutes mins
Total Time 45 minutes mins
Course chicken recipes
Cuisine Mexican
Servings 8 servings
Calories 395 kcal

Ingredients
  

  • 1 tablespoon olive oil
  • 6 (4 to 6 ounces each) boneless skinless chicken thighs or breasts (cut into bite-sized pieces)
  • 4 bell peppers (sliced; vary the colors to make it pretty!)
  • 1 small onion (sliced)
  • 1 recipe or package fajita seasoning mix (taco seasoning may 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
 

  • Preheat oven to 350 degrees F. Over medium heat, saute the chicken in olive oil until chicken is done. Remove from skillet and set aside.
    Making chicken fajita casserole and cooking the chicken in a cast iron skillet.
  • Add onions and peppers and saute until desired tenderness is reached.
    Sauteeing the onions and bell peppers for chicken fajita casserole.
  • Add chicken back to pan and stir in fajita seasoning, sour cream, and cream cheese. Mix well.
    Adding the chicken fajita casserole seasoning to the cooked chicken and peppers.
  • Sprinkle with cheese and bake in oven for 10 to 15 minutes or until cheese is melted.
    Topping the chicken fajita casserole with shredded cheddar cheese before baking.

Video

Kori's Tips

Check out my post above for more helpful hints, substitution ideas, cooking tips, and other delicious recipes.
SUBSTITUTIONS: Use pre-cooked chicken to save some time - about 5 to 6 cups is needed.
TIPS: If you don't have an ovenproof skillet just transfer everything to a greased casserole dish.
SERVING SUGGESTIONS: This is really good topped with avocado, guacamole, sour cream, or salsa. You can also serve over rice or cauliflower rice, or in flour tortillas.

Nutrition

Serving: 1cupCalories: 395kcalCarbohydrates: 9.4gProtein: 29gFat: 28gSaturated Fat: 13gPolyunsaturated Fat: 12gTrans Fat: 1gCholesterol: 162mgSodium: 439mgFiber: 1.8gSugar: 4g
DID YOU MAKE THIS RECIPE?Mention @seekinggoodeatsofficial or tag #seekinggoodeats! Be sure to subscribe to my newsletter to receive more healthy delicious recipes straight to your inbox.

© 2025 Seeking Good Eats™

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Reader Interactions

Comments

  1. Cavy

    February 18, 2025 at 9:19 pm

    This dish is out of this world. It is quick and easy to prepare. It is on my “Fix once a month” menu.

    Reply
  2. Lynne

    August 13, 2024 at 10:03 am

    5 stars
    My family loved this recipe! It worked for those doing Keto and those who are not. This will be in our regular meal rotation from now on.

    Reply
    • Kori Butler

      August 13, 2024 at 11:57 am

      Awwww! Thank you! So glad you love this casserole - it's one of my favorites!

      Reply
  3. Julie

    July 16, 2023 at 6:16 pm

    5 stars
    Great recipe! The only thing I did differently was used just a frying pan and combined everything in it. It was a big hit, thank you so much.

    Reply
    • seekinggoodeats

      July 19, 2023 at 9:07 am

      Great! So glad you loved the casserole. Thanks for giving it a try! 🙂

      Reply
  4. Sasha

    May 12, 2023 at 7:25 pm

    5 stars
    Thought i should leave a review incase anybody else has a bell pepper hater in their family. I’ve been eyeing this recipe up but my partner hates bell peppers (very sad i know) so instead of bell peppers i did a can of corn and a can of black beans. So yummy. Second night we baked it on top of nachos! Delish! Thanks for a great recipe!

    Reply
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4.62 from 414 votes (410 ratings without comment)

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Hey there, I'm Kori.

I’m a culinary school trained chef specializing in holistic nutrition and wellness. I’ve always been a major foodie, and as I’ve aged, the full impact of my love of food—and not-necessarily-healthy eating habits—caught up to me. In an effort to make positive changes in my life (and hopefully yours, too), I created this website where I could share great-tasting, craveable, healthy recipes.

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