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This easy and cheesy Chicken Fajita Casserole is a super delicious and EASY Mexican-inspired recipe! It's loaded with all your favorite classic fajita ingredients - but it's a tasty casserole. Only 8 ingredients and one pan from stovetop to oven! Seriously, your family will love it. Bonus: it's gluten free, low carb, keto-friendly, and has no added sugar!
Watch How to Make Fajita Chicken Casserole
You'll love this keto Chicken Fajita Casserole Recipe!
"This chicken fajita casserole recipe is amazing!! My whole family LOVED it. It will even be a hit with non-keto people. Thanks! "-Shannon, Pinterest
Love fajitas? 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!
Classic fajitas - but it's a casserole. Classic stovetop fajitas turned into a delicious casserole that your whole family will love. Tender chicken with homemade fajita seasoning, blended with shredded cheese and veggies makes the perfect dinner. Serve with a side of cauliflower rice or tortillas for the rest of your family.
It's easy! This casserole is the perfect weeknight meal to make (weekends are good too! LOL). Only 8 ingredients, can you believe it? I think it's total comfort food. Comfort food is great during a crazy weeknight don't you think? 🙂
One Pan Skillet Dinner. While you can use any oven-proof skillet, I love to use my cast-iron skillet for this chicken fajita casserole. If you don't have a cast iron skillet, transfer to a baking dish.
It's low carb! This casserole is gluten free, low carb, keto-friendly, and has no added sugar. The fat can be lowered by using chicken breasts instead of thighs, lowering the amount of cheese used and by substituting fat free sour cream.
Fajita Casserole ingredients
Here are the ingredients you will need to make this healthy 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 healthy seasoning mix. 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!
Be sure to pin this pin to Pinterest for later! 😉
How To Make Chicken Fajita Casserole
2. In an ovenproof skillet saute chicken until done. Remove from pan and keep warm
2. Saute onions and bell peppers until tender.
3. Add chicken back to the pan. Stir in cheddar cheese, sour cream, and seasoning.
4. 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?
For traditional fajitas, cut chicken breast into thin 1/2" 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 Casserole
"I love this warm flavorful, slightly spicy, chicken fajita casserole balanced with the cold crisp freshness of a simple green salad. "-Kori
Meal idea! Serve chicken fajita casserole on its own, with cauliflower rice, or in flour or corn tortillas (or a low carb keto equivalent). Serve a simple fresh side salad with Avocado Dressing.
Top with avocado slices, sour cream, salsa, Chipotle Crema, or Roasted Chili Corn Salsa for added freshness.
What toppings go on chicken fajitas?
Typically people top their fajitas with shredded cheddar cheese, sour cream, salsa or taco sauce, and avocado slices or guacamole. Of course, this is all a personal preference!
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.
Keto Chicken Fajitas casserole tips
- Use boneless chicken thighs or breasts that have been cut into uniform sizes (approx 1" to 2" in size, or you can do 1.2" 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.
- 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!
- 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 baking dish, then top with shredded cheddar cheese and bake.
Fajita Chicken Casserole 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 bell 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.
Chicken Fajitas Casserole
This chicken fajita casserole 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 412 votes
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Author Kori
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.
Add onions and peppers and saute until desired tenderness is reached.
Add chicken back to pan and stir in taco seasoning, sour cream, and cream cheese. Mix well.
Sprinkle with cheese and bake in oven for 10 to 15 minutes or until cheese is melted.
Video
Kori's Tips
Use pre-cooked chicken to save some time - about 5 to 6 cups is needed.
Use 1 recipe of our healthy homemade Taco Seasoning Mix, Fajita Seasoning Mix, or 1 store-bought packet.
Serve and enjoy! This is really good topped with avocado, guacamole, sour cream, or salsa. Yum.
If you don't have an ovenproof skillet just transfer everything to a greased casserole dish.
Nutrition
Serving: 1cupCalories: 395kcalCarbohydrates: 9.4gProtein: 29gFat: 28gSaturated Fat: 13gPolyunsaturated Fat: 12gTrans Fat: 1gCholesterol: 162mgSodium: 439mgFiber: 1.8gSugar: 4g
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More Mexican Recipes
Here are some delicious dishes to make! I've included a mix of Mexican-inspired keto chicken recipes, as well as beef, and even shrimp tacos!
- Zucchini Ground Beef Taco Casserole - one of the best taco casserole recipes!
- Homemade Salsa Verde Recipe
- Chicken Fajita Soup (Crockpot + Instant Pot) - Fajita flavor packed into a heart creamy soup!
- Birria Tacos with Consommé - serve this as a stew! So delicious.
- The Best Low Carb Keto Shrimp Tacos - Oh how I love these. Super easy and quick to make.
- Low Carb Chicken Enchiladas (Keto Zucchini Enchilada Boats) - these are a fun way to use up all the zucchini coming out of the garden!
- Taco Stuffed Bell Peppers (Keto Stuffed Peppers) - one of my top recipes and a family favorite dinner idea!
- Green Enchiladas Chicken Soup (Keto Slow Cooker Mexican Soup) - the #1 soup on the website! 🙂
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