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    Home / Recipes / Dinner / Keto Chicken Fajita Casserole

    Keto Chicken Fajita Casserole

    September 12, 2023 by Keto Cooking Christian Leave a Comment

    This post may contain affiliate links. As an Amazon Associate I earn from qualifying purchases, see Disclosure.
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    This Keto Chicken Fajita Casserole recipe combines tender strips of seasoned chicken with a medley of sauteed peppers and onions. It’s a one-skillet, mouthwatering Tex-Mex experience!

    Keto Chicken Fajita Casserole in skillet with some missing and slices of lime on side
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    Jump to:
    • ❤️ Why You’ll Love this Chicken Fajita Casserole
    • 🛒 Ingredients for Chicken Fajitas Casserole
    • 🔪 How to Make Fajita Chicken Casserole
    • 🔄 Easy Chicken Fajita Casserole Substitutions and Additions
    • Why are Chicken Fajitas Healthy?
    • Are Fajitas Keto Friendly?
    • What is a Good Side Dish for Fajitas?
    • Should You Slice Chicken Before Cooking Fajitas?
    • Can I Freeze Leftovers?
    • 🍽️ More Keto Mexican Recipes

    ❤️ Why You’ll Love this Chicken Fajita Casserole

    • Perfectly seasoned tender juicy chicken strips
    • Classic fajita flavors with caramelized onions and bell peppers
    • Creamy cheese sauce baked until golden and bubbly
    • Made in one pan for easy cleanup
    spatula holding piece of Keto Chicken Fajita Casserole

    Craving Mexican but trying to keep those carbs in check? Then you’re going to love this chicken fajita casserole recipe. It’s a hearty, one-skillet dish that features tender strips of juicy chicken, sautéed bell peppers and onions, gooey cheese, with a savory homemade fajita seasoning. 

    Baked to bubbly, golden perfection, this super flavorful casserole comes together in under 45 minutes, making it an awesome busy weeknight meal that the whole family will love. A great bonus about this recipe is that it's loaded with healthy fats, protein and vegetables that you can enjoy guilt-free.

    slice of Keto Chicken Fajita Casserole on white plate with sliced lime and avocado and skillet in background

    If you love the deliciously robust flavors and cheesy goodness of this casserole, you may want to also check out these Keto Chicken Enchiladas.

    🛒 Ingredients for Chicken Fajitas Casserole

    • Chicken
    • Bell peppers
    • Red onion
    • Pepper jack cheese
    • Cream cheese
    • Sour cream
    • Olive oil
    • Butter
    • Homemade Fajita Seasoning
    • Cilantro
    • Lime
    • Salt
    • Ground black pepper

    *Exact measurements are listed in the recipe card below.

    🥣 Recommended Tools

    • Skillet
    • Sharp knife
    • Measuring cups and spoons

    🔪 How to Make Fajita Chicken Casserole

    Slice each boneless skinless chicken breast into three thin filets, then slice them into strips so you end up with very thin strips.

    strips of raw chicken in white bowl

    Heat a skillet to medium, add in half the olive oil, half the butter and chicken strips.  Season with half the salt and the homemade fajita seasoning. 

    Tip: If your pan is on the smaller side, you might sauté the chicken in two batches like I did. You can use either a stainless or a cast iron skillet.

    raw chicken strips in skillet with fajita seasoning

    Sauté until the chicken is almost cooked through, then remove it and set it aside.

    Tip: The chicken will finish cooking in the oven.

    cooked chicken strips seasoned with fajita seasoning in skillet

    Preheat oven to 375°F.

    sliced red yellow and orange bell peppers and red onions in skillet uncooked

    Add in the remaining olive oil, butter, salt and pepper, along with the bell peppers and onions. 

    sliced red yellow and orange bell peppers and red onions in skillet cooked

    Sauté for several minutes or until the onions are slightly caramelized.

    Tip: Don't rush this part, you want to get good caramelization, which will give the casserole great flavor.

    dollops of sour cream and cream cheese with cilantro and lime in skillet over fajitas

    Turn off the heat, add in the cream cheese, sour cream and lime juice and zest.

    chicken fajitas in skillet

    Stir until melted, then add the chicken back in and half the pepper jack cheese and stir until combined. 

    Tip: If you don't have pepper jack cheese, you can use a Mexican cheese blend, cheddar, Colby, Monterey jack or shredded cheddar cheese instead.

    Keto Chicken Fajita Casserole with shredded pepper jack cheese on top unbaked

    Add the remaining pepper jack cheese on top and bake for 20-22 minutes or until the cheese is melted and golden.

    Keto Chicken Fajita Casserole in skillet with 4 lime slices on top

    Serve with a garnish of cilantro and any of your favorite toppings.

    closeup of Keto Chicken Fajita Casserole in skillet with piece missing and 4 lime slices

    🔄 Easy Chicken Fajita Casserole Substitutions and Additions

    • Chicken: This recipe calls for chicken breast, but you can use the equal weight of boneless skinless chicken thighs if you prefer dark meat.
    • Other protein choices: Feel free to swap out the chicken and make this a shrimp or steak fajita casserole.
    • Veggies: Add other nutritional vegetables based on how many carbs you are trying to stick with. Zucchini, black beans, mushrooms, and whole-kernel corn are other tasty options, though they will up the carb count.
    • Extra heat: Add a fiery kick with thinly sliced jalapeño peppers or a big pinch of cayenne pepper.
    • Toppings: This healthy chicken fajita casserole is wonderful just as it is. But, for additional Mexican flavors, you can add a dollop of this homemade guacamole, Pico de Gallo, sour cream, or these pickled jalapeño peppers to each serving.
    piece of Keto Chicken Fajita Casserole on white square plate with avocado and lime slices

    Why are Chicken Fajitas Healthy?

    The nutritional value of fajitas can vary depending on how you prepare and serve them. For example, chicken breasts offer a lean and low-calorie protein source suitable for most diets, while bell peppers provide essential vitamins C and B6.

    This fajita chicken casserole recipe takes it one healthy step further by using a homemade seasoning blend that does not contain added sugars.

    Are Fajitas Keto Friendly?

    Traditional fajitas are typically served with flour or corn tortillas. This really impacts the carbs. A chicken fajita with tortillas may contain about 25-35 grams of carbohydrates per serving.

    You can skip that worry by making this casserole instead or you can serve your fajitas with these homemade Keto tortillas.

    slice of Keto Chicken Fajita Casserole on white plate with sliced lime and avocado and skillet in background

    What is a Good Side Dish for Fajitas?

    If you're following Keto and want side dishes to complement your fajitas, here are some popular choices.

    • Mexican cauliflower rice  
    • Mediterranean cucumber salad   
    • Air fryer asparagus
    • Grilled broccolini   
    • Mexican coleslaw
    • Leafy green or spinach salad with lime cilantro dressing
    • Air fryer roasted green beans
    closeup of Keto Chicken Fajita Casserole in skillet with piece missing and 4 lime slices

    Should You Slice Chicken Before Cooking Fajitas?

    There are two schools of thought on the best way to prepare chicken fajita meat. The first one is to cook the breast whole then slice and add the sauteed veggies.

    The other and most preferred way is to slice the raw chicken breasts before cooking. This allows all sides of the sliced chicken to be seasoned and to brown nicely.

    Can I Freeze Leftovers?

    You sure can! Here are a few easy steps:

    1. Cool it: Before freezing, allow the chicken fajita casserole to cool to room temperature.   
    2. Wrap it:  Use airtight, freezer-safe containers or heavy-duty freezer bags to wrap the portions.
    3. Label it: Use a permanent marker to write the date on the container.
    4. Serve it: For the best results, chicken fajita casserole should be thawed and eaten within 2-3 months.  

    🍽️ More Keto Mexican Recipes

    • Easy Taco Casserole
    • Creamy Chicken Poblano
    • Baked Southwest Skillet
    • Stuffed Poblano Peppers
    • Mexican Cauliflower Rice
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    Keto Chicken Fajita Casserole in skillet with some missing and slices of lime on side

    Keto Chicken Fajita Casserole

    This Keto Chicken Fajita Casserole recipe combines tender strips of seasoned chicken with a medley of sauteed peppers and onions. It’s a one-skillet, mouthwatering Tex-Mex experience!
    5 from 49 votes
    Author: Julianne
    Servings 8
    Print Pin
    Save RecipeSaved!
    PREP 10 minutes mins
    COOK 33 minutes mins
    TOTAL 43 minutes mins

    Ingredients
     

    • 2 pounds chicken, cut into thin strips
    • 3 bell peppers, red and yellow, cut into strips
    • ½ large red onion, sliced thin
    • 2 cups pepper jack cheese, shredded
    • 8 ounces cream cheese, cut into cubes
    • ½ cup sour cream
    • 3 tablespoons olive oil, divided
    • 2 tablespoons butter, divided
    • 1 tablespoon Homemade Fajita Seasoning
    • 2 tablespoons fresh cilantro, chopped
    • zest and juice of 1 lime
    • 1 teaspoon salt
    • ¼ teaspoon ground black pepper

    Instructions
     

    • Slice each chicken breast into three thin filets, then slice them into strips so you end up with very thin strips.
    • Heat a skillet to medium, add in half the olive oil, half the butter and chicken strips. Season with half the salt and the fajita seasoning. If your pan is on the smaller side, you might sauté the chicken in two batches like I did.
    • Sauté until the chicken is almost cooked through, then remove it and set it aside.
    • Preheat oven to 375°F.
    • Add in the remaining olive oil, butter, salt and pepper, along with the bell peppers and onions. Sauté for several minutes or until the onions are slightly caramelized.
    • Turn off the heat, add in the cream cheese, sour cream and lime juice and zest. Stir until melted, then add the chicken back in and half the pepper jack cheese and stir until combined. Add the remaining pepper jack cheese on top and bake for 20-22 minutes or until the cheese is melted and golden.
    • Serve with a garnish of cilantro and any of your favorite toppings like a dollop of sour cream and pickled jalapeño peppers.

    Recipe Notes

    If you don't have pepper jack cheese, you can use a Mexican cheese blend instead, or cheddar, colby or Monterey Jack.
    If you don't have red onion, yellow onion will work just fine.

    *Make sure to scroll up and read the post for substitutions, additions and helpful tips for making this recipe.

    Course Main Course
    Cuisine Mexican
    Calories 418kcal
    Nutrition Facts
    Keto Chicken Fajita Casserole
    Amount per Serving
    Calories
    418
    % Daily Value*
    Fat
     
    28
    g
    43
    %
    Saturated Fat
     
    14
    g
    88
    %
    Carbohydrates
     
    6
    g
    2
    %
    Fiber
     
    1
    g
    4
    %
    Sugar
     
    3
    g
    3
    %
    Protein
     
    44
    g
    88
    %
    * Percent Daily Values are based on a 2000 calorie diet.

    *Nutritional data is provided as a courtesy and is accurate to the best of my knowledge. You can verify it using the nutrition calculator of your choice. All data is based on net carbs, without sugar alcohol: Swerve, Erythritol, Monk Fruit or Allulose.

    © Copyright for Keto Cooking Christian LLC. Please use the share buttons to share on social media, but please do not copy/paste the recipe.

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    Filed Under: Casseroles, Chicken, Dinner, Mexican, Posts, Recipes

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    Julianne Walser KCC

    I'm Julianne, welcome! I offer tasty and indulgent Keto and Low Carb recipes that will never leave you feeling deprived!

    More about me →

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