Mouthwatering Keto Chicken Fajita Casserole: A Healthy, Low-carb Recipe for Dinner

Welcome to Your New Favorite Keto Dinner

Embark on a culinary adventure with our Keto Chicken Fajita Casserole. This dish is a perfect symphony of succulent chicken, vibrant bell peppers, and rich, melted cheese, all nestled in a comforting, low-carb casserole. Ideal for those on a ketogenic diet, this recipe is not only delicious but also aligns with your health goals, providing high fat and low carb nutrition in every bite.

Whether you’re a seasoned keto enthusiast or just starting out, this casserole promises to be a crowd-pleaser. It’s an excellent way to enjoy a Mexican-inspired feast without compromising your dietary needs. Let’s dive into why this keto chicken fajita casserole will become a staple in your meal rotation.

Keto Chicken Fajita Casserole

A Dish Born from Tradition and Innovation

The Keto Chicken Fajita Casserole is more than just a meal; it’s a testament to the versatility of keto cooking. Inspired by the classic flavors of Mexican cuisine, this casserole is a creative spin on traditional fajitas. By deconstructing the typical fajita and transforming it into a casserole, we maintain the essence of the dish while making it keto-friendly.

Key ingredients like chicken breast provide a high-protein base, essential for muscle maintenance on a low-carb diet. The bell peppers and onions add not only a pop of color but also a wealth of nutrients, including vitamin C and fiber. The combination of cheddar and cream cheese introduces a creamy texture and a dose of healthy fats, crucial for achieving ketosis.

Each spice in the seasoning blend has been chosen for its bold flavor and health benefits. For example, chili powder can aid in digestion, while cumin is known for its anti-inflammatory properties. These spices, along with garlic and paprika, create a depth of flavor that makes this casserole a true fiesta in your mouth, without adding unnecessary carbs.

Ingredients for Keto Chicken Fajita Casserole

Mastering the Casserole Craft

Creating the perfect Keto Chicken Fajita Casserole is about understanding the nuances of each step. Begin by cooking the chicken to just the right point where it’s tender yet fully cooked. Avoid overcooking, as the chicken will continue to cook in the oven, ensuring it remains juicy and flavorful.

When sautéing the vegetables, aim for that slight char to emulate the fajita experience. This not only adds a smoky flavor but also enhances the natural sweetness of the peppers and onions. As for the seasoning, ensure it’s evenly distributed to coat every strip of chicken and vegetable for a consistent taste throughout the casserole.

The cream cheese mixture is the heart of the dish’s creaminess. For best results, let the cream cheese soften at room temperature before blending it with the heavy cream. This step ensures a smooth, rich layer that will envelop the other ingredients, locking in moisture and flavor.

Keto Chicken Fajita Casserole in the Oven

Creative Twists on a Keto Classic

Spicy Jalapeño Popper Fajita Casserole

For those who love a fiery kick, add diced jalapeños to the vegetable mix. You can also mix in some bacon bits for a popper-inspired twist. The heat from the jalapeños, combined with the smokiness of bacon, will take this casserole to new heights.

Tex-Mex Keto Fajita Casserole

Incorporate a Tex-Mex flair by adding a layer of keto-friendly, low-carb black soy beans or sprinkling in some taco seasoning. Top with a dollop of guacamole and a sprinkle of cotija cheese for a fusion of flavors that’s sure to please.

Vegetarian Keto Fajita Casserole

Swap the chicken for hearty portobello mushrooms or eggplant to cater to a vegetarian keto diet. These vegetables provide a meaty texture and are excellent at absorbing the fajita seasoning, ensuring a delicious and satisfying meal.

Flexible Ingredients for Every Keto Kitchen

Understanding that everyone’s pantry is different, here are some substitutions to keep your casserole keto while accommodating what you have on hand:

Chicken Thighs for Chicken Breasts: If you prefer darker meat or simply have chicken thighs available, they make a great substitute. They’re higher in fat, which can be beneficial for those on a keto diet, and they bring a richer flavor to the dish.

Dairy-Free Options: For a dairy-free version, replace the cheeses with dairy-free alternatives like nutritional yeast for a cheesy flavor, and use coconut cream in place of heavy cream for richness.

Different Vegetables: Feel free to use any low-carb vegetables you have. Zucchini or yellow squash can add variety, while still keeping the carb count in check.

Answers to Your Burning Questions

Here are some frequently asked questions to guide you through making the perfect Keto Chicken Fajita Casserole:

Can I make this casserole ahead of time? Yes! Assemble the casserole, cover, and refrigerate. When ready to eat, bake as directed, adding a few extra minutes to the cooking time.

How can I make this casserole spicier? Add more chili powder, a pinch of cayenne pepper, or diced hot peppers to the mix to turn up the heat.

Is this casserole suitable for freezing? It freezes well. Cool completely, cover tightly, and freeze. Thaw in the refrigerator overnight and reheat in the oven.

Can I use pre-cooked chicken? Absolutely. Pre-cooked chicken can be a time-saver. Just mix it with the vegetables and proceed with the recipe.

What are the best toppings for this casserole? Fresh cilantro, avocado slices, lime wedges, and sour cream are all excellent keto-friendly toppings that add freshness and flavor.


Keto Chicken Fajita Casserole

Dive into a flavorful, low-carb fiesta with our Keto Chicken Fajita Casserole, combining succulent chicken, colorful peppers, and melted cheese for a comforting meal that fits your keto lifestyle.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Course Dinner
Cuisine Mexican
Servings 6 people
Calories 385 kcal


  • Large frying pan
  • Mixing bowls
  • 9x13 inch casserole dish


  • 1 ½ lbs chicken breast cut into strips
  • 2 bell peppers any color, sliced
  • 1 medium onion sliced
  • 1 cup shredded cheddar cheese
  • ½ cup cream cheese softened
  • ¼ cup heavy cream
  • 2 tablespoons olive oil
  • 2 teaspoons chili powder
  • 1 teaspoon ground cumin
  • 1 teaspoon garlic powder
  • 1 teaspoon paprika
  • ½ teaspoon salt
  • ½ teaspoon black pepper
  • Fresh cilantro for garnish (optional)


  • Preheat your oven to 375°F (190°C).
  • In a large frying pan, heat the olive oil over medium heat. Add the chicken strips and cook until they're no longer pink in the middle, about 5-7 minutes.
  • Remove the chicken from the pan and set aside. In the same pan, add the sliced bell peppers and onion. Sauté until they are tender and slightly charred, about 8-10 minutes.
  • In a small bowl, mix together the chili powder, ground cumin, garlic powder, paprika, salt, and black pepper.
  • In a separate bowl, combine the softened cream cheese and heavy cream until you get a smooth mixture.
  • Return the cooked chicken to the pan with the vegetables, sprinkle the seasoning mix over the top, and stir to coat everything evenly.
  • Pour the cream cheese mixture into the pan and mix until all ingredients are well combined.
  • Transfer the mixture to a greased 9x13 inch (23x33 cm) casserole dish and spread evenly.
  • Sprinkle the shredded cheddar cheese over the top of the casserole.
  • Bake in the preheated oven for 15-20 minutes, or until the cheese is melted and bubbly.
  • Garnish with fresh cilantro before serving, if desired.


Adjust the level of spice to your preference by adding more or less chili powder.
For a complete keto meal, serve with a side of cauliflower rice or a fresh green salad.
Leftovers can be stored in the refrigerator for up to 3 days and make for an easy, microwavable lunch option.


Calories: 385kcalCarbohydrates: 6gProtein: 35gFat: 25gFiber: 2gNet Carbs: 4g
Keyword keto chicken fajita casserole, low carb chicken casserole, Mexican Keto Dinner
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