Enjoy those bold, sizzling fajita flavors in a cozy, family-friendly casserole. This Keto Chicken Fajita Casserole layers tender rotisserie chicken with colorful peppers and onions, all tossed in a zesty homemade fajita seasoning.
This chicken fajita bake delivers all the sizzling fajita flavor you love without the carb-heavy tortillas. It's quick to make, great for weeknights, and perfect for meal prep.
This recipe was inspired by our Keto Sour Cream Chicken Enchilada Casserole, and since fajitas are just as loved in our home, this was an easy win. If you enjoy this dish, try our Keto Green Chile Chicken Casserole, or Keto Breakfast Casserole next. You can also explore our Clean Keto Diet Guide and Free Meal Plan for more support.
Before cooking or sitting down to eat, consider setting a simple intention to nourish your body well. If you're new to intention setting, our Intentions and Affirmations Guide is a great place to start.
⚡ Quick Look: Keto Chicken Fajita Casserole
- 🎨 Flavor Profile: Smoky, creamy, and a little zesty - classic fajita flavor without the carbs.
- 🔥 Method: Sauté peppers and onions, mix with shredded chicken, seasoning, and creamy base, then bake.
- ⏱️ Time: About 30 minutes
- 🍽️ Yield: Serves 6
- 🌿 Skill Level: Easy
- 🥣 Main Ingredients: Shredded chicken, bell peppers, onions, Greek yogurt or cream cheese, fajita seasoning
- 🌞 Best Time to Enjoy: Weeknight dinners, meal prep lunches
- 🎯 Main Benefits: Low-carb, family-friendly, comforting, uses everyday ingredients
Summarize and save this content on
Jump to:
💜 Why You'll Love It
- All the bold fajita flavor, no tortillas needed
- Creamy, cheesy, and super satisfying while staying low-carb
- Comes together fast - perfect for busy weeknights
- Easy to meal prep and reheats beautifully in the oven
- Uses simple ingredients you likely already have on hand
- Family-friendly and customizable for spice level preferences
Ingredients
Cooked Chicken: Buy a pre-cooked organic rotisserie chicken and shred it up for easy and quick use. Otherwise, get boneless skinless chicken thighs or breasts and cook them in the Instant Pot or slow cooker, and shred.
Avocado Oil: I use this oil because it has a high smoke point. Check out this helpful article, Avocado Oil vs Coconut Oil for Cooking.
Bell Peppers: For a colorful meal with a variety of phytonutrients, we recommend getting one of each color- a red, yellow, orange, and green bell pepper! Organic is best.
Fage 5% yogurt: This full-fat yogurt is a brand I trust. It also adds a thick and creamy consistency that is similar to cream cheese.
Shredded Cheese: Either Monterey Jack or Mexican Blend works well. Be sure to get organic cheese and check the ingredients. It's best to get a block of cheese to shred to avoid hidden starches (carbs!).
See the recipe card for the full list of ingredients and quantities.
Substitutions & Tips
For a vegetarian version, use jackfruit instead of chicken, or add black beans and skip the chicken.
No diced tomatoes with green chilies? Use about 1 cup of salsa.
Cream cheese, sour cream, or full-fat yogurt all work to create the creamy base.
You can use a store-bought fajita seasoning packet if needed - just check ingredients for clean, simple spices.
If you're not strictly low-carb, serve with sprouted-grain or organic tortillas. Low-carb tortillas are also an option.
How to Make Keto Chicken Fajita Casserole
Step 1: Set oven to 350°F. Place shredded chicken in a large bowl. Heat oil in a large skillet and saute sliced peppers and onions.
Step 2: Add sauteed onions and peppers to the chicken bowl and stir.
Step 3: In a separate bowl, mix together the can of diced tomatoes with yogurt, half of the shredded cheese (1 cup), and all of the seasonings.
Step 4: Combine the sauce mixture with the chicken mixture and mix together well. Pour the mixture into a medium casserole dish or baking dish and evenly top it with the remaining cup of cheese. Place in the oven for 20-25 minutes or until cheese is melted and starting to brown.
Step 5: Let cool for 1 minute and serve with your choice of toppings. Enjoy!
Hint: If you use a cast-iron skillet to saute the veggies, you can transfer the mixture back into that and put it in the oven to save on clean-up!
Keto Chicken Fajita Casserole FAQs
Mexican food like fajitas can easily be transformed into low-carb keto recipes by making simple swaps or omitting carbohydrate-rich ingredients like tortillas. After trying our low-carb chicken fajita casserole, you won't even miss your old tortilla wraps! It is a family favorite in our home and one of many that is proof that you can eat low-carb and still eat many of your favorite foods.
The vegetables in fajitas are onions and bell peppers. Most vegetables are low in carbohydrates, including peppers and onions. The vegetables that tend to be higher in carbohydrates are corn and root vegetables like potatoes, carrots, and beets.
Some spices and seasonings have a few carbs in them, especially when they are not pure or organic. However, the amount of net carbs in spices is typically negligible, especially when used in moderation.
More Keto Recipes
Looking for other keto recipes? Try these:
Love this Keto Chicken Fajita Casserole? Let us know how it went in the comments 👇and give it a 🌟 review! Don't forget to subscribe for all the latest healthy recipes! Love Fajitas? Try our Leftover Steak Fajitas!
Recipe
Clean Keto Chicken Fajita Casserole
Equipment
- large bowl
- Medium bowl
- large spoon
- cutting board
Ingredients
- 3 cups shredded chicken
- 1 teaspoon avocado oil
- 4 bell peppers (one red, yellow, orange, and green) cut into thin strips
- 1 small yellow onion thin short slices
- 1 can diced tomatoes with green chilies
- 5 oz full fat yogurt Fage 5%
- 2 cup Monterey Jack or Mexican style cheese shredded and divided
- 1.5-2 teaspoon chipotle Chile powder
- ½ teaspoon pink Himalayan salt
- ½ teaspoon smoked paprika
- ¼ teaspoon black pepper
- ½ teaspoon onion powder
- ½ teaspoon garlic powder
- ½ teaspoon oregano
- ½ teaspoon ground cumin
- ⅛ teaspoon cayenne powder
- 1 pinch pure monk fruit powder (optional)
- Diced Avocados, Greek yogurt, lime wedges, freshly diced tomatoes optional toppings
Instructions
- Preheat oven to 350 F place shredded chicken in a large bowl, set aside. Heat avocado oil in large skillet over medium heat until oil glistens. Add sliced peppers and onions. Sauté for 5-7 min or until softened.
- Remove from heat and toss in with the shredded chicken and set aside.
- In a medium bowl mix together fage 5% Greek yogurt, crushed tomatoes, all of the powdered seasonings, 1 cup shredded cheese and stir to combine.
- Add the sauce mixture to the chicken mixture and stir together. Place the entire fajita mix together in a casserole dish and top with the remaining shredded cheese. Place in the oven for 25-30 min until cheese is slightly golden and melted. Let cool for 1 min. Garnish with cilantro and top with your choice of toppings. Serve warm.
Notes
- For extra creaminess, stir in full-fat Greek yogurt or cream cheese.
- If you're not low-carb, serve with sprouted-grain tortillas or use low-carb tortillas.
- Adjust the heat by adding more or less chili powder or cayenne.
- Bake the casserole ahead, let it cool, then refrigerate for easy weeknight reheats.
- Cook chicken breast in a slow cooker or Instant Pot and shred to make your own chicken. I used a rotisserie in this recipe for convenience.
Jill says
This looks great! Can't wait to try it!
Natalie Perry says
it's very good!