If you’re craving bold fajita flavors without the hassle of tortillas, this Chicken Fajita Casserole is your perfect solution. This easy-to-make dish combines juicy chicken, colorful bell peppers, and creamy cheese to deliver a cheesy, flavorful casserole the whole family will love. Whether you’re looking for a weeknight dinner or a dish to impress guests, this Chicken Fajita Casserole is both quick and delicious, offering a healthy, low-carb alternative to traditional fajitas.

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Why You’ll Love This Chicken Fajita Casserole
Chicken Fajita Casserole takes all the savory, spicy, and cheesy flavors of classic fajitas and transforms them into a fuss-free, baked casserole. Perfect for busy nights, this recipe requires only 8 ingredients and minimal prep, making it a go-to for families, meal planners, and anyone craving a hearty, satisfying meal. Plus, it’s high in protein, low-carb, and keto-friendly, making it suitable for a variety of dietary preferences.
Ingredients for Chicken Fajita Casserole
- Olive Oil: Adds healthy fats and helps to sauté the chicken and veggies.
- Chicken Thighs (or Breasts): Tender, juicy meat that serves as the base of this casserole. Boneless, skinless thighs are recommended for the best flavor.
- Bell Peppers: A mix of colorful peppers adds crunch, sweetness, and a boost of vitamins.
- Yellow Onion: Provides a savory depth and complements the sweetness of the peppers.
- Fajita Seasoning: A blend of spices that gives this dish its classic fajita flavor, enhancing the overall taste.
- Sour Cream: Adds creaminess and a subtle tang that balances out the spices.
- Cream Cheese: Helps to bind the casserole together, making it extra creamy.
- Cheddar Cheese: Melts beautifully on top for a cheesy finish that ties the entire dish together.
Alternative Ingredient Suggestions
If you have dietary preferences or need to use what you already have at home, consider these ingredient swaps:
- For a dairy-free version: Use plant-based sour cream and dairy-free cheese.
- For a lighter version: Swap chicken thighs for boneless skinless chicken breasts, and use reduced-fat cream cheese and sour cream.
- Spice it up: Opt for pepper jack cheese instead of cheddar for an extra kick.
Step-by-Step Instructions
- Cook the Chicken: Heat olive oil in a skillet over medium heat. Add the chicken pieces and cook until browned and fully cooked, about 7-10 minutes. Remove the chicken from the skillet and set it aside.
- Sauté the Vegetables: In the same skillet, add the sliced bell peppers and onions. Sauté for about 5 minutes, or until tender.
- Combine Ingredients: Return the chicken to the skillet. Stir in the fajita seasoning, sour cream, and cream cheese, mixing everything until well-combined and creamy.
- Add Cheese and Bake: Sprinkle the top of the casserole with shredded cheddar cheese. Place the skillet in the oven at 350°F and bake for 10-15 minutes or until the cheese is melted and bubbly.
- Serve and Enjoy: Remove from the oven, and serve hot. Top with optional garnishes such as avocado, salsa, or cilantro.

Tips & Tricks for the Best Chicken Fajita Casserole
- Don’t Overbake: Since most of the ingredients are already cooked, you only need to bake the casserole to melt the cheese. Overbaking can cause the casserole to dry out.
- Cut Uniform Chicken Pieces: Ensure the chicken is cut into uniform pieces (about 1-2 inches) to ensure even cooking.
- Customize the Veggies: If you prefer softer veggies, cook the onions and peppers longer. For a bit of crunch, sauté them for a shorter time.
- Check the Temperature: Make sure the chicken reaches an internal temperature of 165°F to ensure it’s fully cooked and safe to eat.
Pairing Ideas and Variations
This Chicken Fajita Casserole is versatile and can be served with various sides or toppings:
- Serve with Tortillas: For a more traditional fajita experience, serve this casserole with flour or low-carb tortillas.
- Over Rice or Cauliflower Rice: Serve over white rice, brown rice, or cauliflower rice for a low-carb option.
- Top with Fresh Garnishes: Avocado, sour cream, guacamole, salsa, or cilantro are all great additions for extra flavor.
- Spicy Version: Add diced jalapeños or cayenne pepper to the casserole for an extra layer of heat.
Health Benefits of Chicken Fajita Casserole
This casserole isn’t just tasty—it’s also packed with nutritional benefits. Chicken provides high-quality protein, while bell peppers are a great source of vitamin C. The combination of sour cream, cream cheese, and cheddar adds healthy fats, making this casserole both satisfying and nutritious. Plus, it’s naturally gluten-free and can be easily adapted to keto and low-carb diets.
How to Store Chicken Fajita Casserole
If you have leftovers (which is unlikely, given how delicious it is), store the casserole in an airtight container in the refrigerator for up to 3 days. This dish doesn’t freeze well, as the peppers become watery and the dairy separates when thawed.
Chicken Fajita Casserole is a quick, flavorful, and customizable dish that’s perfect for busy nights. With just a few ingredients and minimal prep, you can have a comforting meal on the table in under an hour. Whether you’re serving it to family or hosting friends, this casserole will surely be a hit.
Conclusion
Chicken Fajita Casserole is the perfect blend of savory chicken, colorful peppers, and creamy cheese all wrapped up in one satisfying, easy-to-make dish. Whether you’re following a keto or low-carb lifestyle or just want a quick weeknight dinner, this recipe checks all the boxes. It’s packed with flavor, minimal ingredients, and can be customized to suit any taste or dietary preference. Serve it over rice or tortillas for a complete meal, or enjoy it as-is for a low-carb option. With its unbeatable flavor and simple preparation, this Chicken Fajita Casserole will become a staple in your recipe rotation.
Frequently Asked Questions (FAQs)
Can I use chicken breast instead of chicken thighs for this recipe?
Yes, you can definitely substitute boneless skinless chicken breasts for chicken thighs in this Chicken Fajita Casserole. While chicken thighs offer a juicier, richer flavor, chicken breasts will work perfectly as a leaner option. Just make sure to cook the chicken thoroughly, as it might take slightly less time to cook than thighs.
Can I make Chicken Fajita Casserole ahead of time?
Absolutely! You can prepare this casserole a day in advance by cooking the chicken and veggies, mixing in the seasonings, and assembling the casserole. Store it in the fridge, and bake it when you’re ready to serve. This will save you time and effort on busy nights.
How do I store leftovers?
To store leftovers, let the casserole cool to room temperature and then transfer it to an airtight container. It will keep in the refrigerator for up to 3 days. Unfortunately, this casserole doesn’t freeze well due to the creamy ingredients and the water content from the peppers, which can make the texture change when thawed.
More Relevant Recipes
- Creamy Slow Cooker Fiesta Chicken: This recipe combines tender chicken with a creamy and zesty sauce that offers a similar Mexican-inspired flavor profile to the Chicken Fajita Casserole. It’s perfect for those who love a slow-cooked, easy meal that’s both comforting and flavorful.
- Taco Soup Recipe: A hearty and flavorful dish, Taco Soup is a great option for those who enjoy the bold flavors of tacos and fajitas. Packed with ground meat, beans, and vegetables, it offers a comforting meal similar to the casserole, but in soup form.
- Slow Cooker Chicken Enchilada Casserole: If you love casserole dishes with Mexican flavors, this Chicken Enchilada Casserole is a great alternative. With layers of tortillas, chicken, cheese, and enchilada sauce, it’s an easy, delicious dish that complements the fajita-inspired casserole.
Chicken Fajita Casserole
- Prep Time: 10 minutes
- Cook Time: 35 minutes
- Total Time: 45 minutes
- Yield: 8 servings 1x
- Category: Chicken, Casserole, Mexican
- Method: Stovetop and Bake
- Cuisine: Mexican
Description
Chicken Fajita Casserole is a flavorful and easy-to-make dish that combines juicy chicken, bell peppers, onions, creamy cheese, and fajita seasoning. A perfect one-pan meal that brings the sizzling flavors of fajitas into a cheesy, baked casserole. Ideal for a quick weeknight dinner or family meal.
Ingredients
- 1 tablespoon olive oil
- 6 boneless skinless chicken thighs (or breasts), cut into bite-sized pieces
- 4 bell peppers, sliced (use a variety of colors for a beautiful presentation)
- 1 small yellow onion, sliced
- 1 recipe or package fajita seasoning mix (or taco seasoning mix)
- 1 cup sour cream
- 4 ounces cream cheese, softened
- 2 cups shredded cheddar cheese
- Optional toppings: avocado slices, guacamole, sour cream, salsa
Instructions
- Preheat the oven to 350°F (175°C).
- Heat olive oil in a large ovenproof skillet over medium heat. Add the chicken pieces and cook until browned and fully cooked, about 7-10 minutes. Remove the chicken from the skillet and set it aside.
- Add the sliced onions and bell peppers to the skillet. Sauté for about 5 minutes, or until tender.
- Return the chicken to the skillet. Stir in the fajita seasoning, sour cream, and cream cheese. Mix well to combine.
- Top the mixture with shredded cheddar cheese, and place the skillet in the oven. Bake for 10-15 minutes, or until the cheese is melted and bubbly.
- Remove from the oven and serve with optional toppings like avocado, salsa, or sour cream.
Notes
- For a lower-fat version, you can use chicken breasts instead of thighs and opt for reduced-fat sour cream and cream cheese.
- If you don’t have an ovenproof skillet, transfer everything to a casserole dish before baking.
- Feel free to add extra vegetables like zucchini or mushrooms for a more hearty casserole.
- This recipe can also be served with rice, cauliflower rice, or tortillas for a more traditional fajita experience.
Nutrition
- Serving Size: 1 cup
- Calories: 395 kcal
- Sugar: 4g
- Sodium: 439mg
- Fat: 28g
- Saturated Fat: 13g
- Unsaturated Fat: 12g
- Trans Fat: 1g
- Carbohydrates: 9.4g
- Fiber: 1.8g
- Protein: 29g
- Cholesterol: 162mg
