If you want bold fajita flavor in an easy, single-bake dish, this chicken fajita casserole is a winner. Built from just eight ingredients — juicy chicken, bell peppers, onion, fajita seasoning, sour cream, cream cheese, and two cheeses — this high-protein, low-carb casserole is creamy, cheesy, and full of flavor.
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The backstory.
I did it again — forgot the tortillas. Every time I start with sizzling chicken, melty cheese, and creamy filling, I get excited and then realize there are no tortillas on hand.
Instead of stopping dinner prep, I turned the flavors into this chicken fajita casserole. It keeps all the fajita goodness and is so satisfying nobody misses the tortillas.
xoxo Kori
One reader says:
This chicken fajita casserole recipe is easy and so delicious!! My whole family loved it. Thanks! 😍 – Shannon, Pinterest
The must-make chicken fajita casserole recipe!
Classic fajita flavor — in a casserole. This recipe captures the sizzling, peppery flavors of fajitas in a baked, cheesy dish. No tortillas required, though you can serve them on the side if you like.
Quick and easy one-pan meal. From stovetop to oven in one skillet with only eight ingredients, this fajita casserole cuts down on prep and cleanup.
Healthy and adaptable. This casserole is high in protein, and can be gluten-free, low-carb, or keto-friendly depending on your choices. There’s no added sugar.
- To lower the fat: use chicken breasts instead of thighs, reduce the cheese, and substitute lower-fat cream cheese and sour cream.
What you’ll need.
These are the ingredients for this easy chicken fajita casserole:
- Olive oil
- Chicken thighs — boneless, skinless; chicken breasts work too
- Bell peppers — any colors you like
- Yellow onion — or sweet, white, or red onion
- Fajita or taco seasoning — homemade or store-bought; homemade is easy and flavorful
- Sour cream
- Cream cheese
- Shredded cheddar cheese — mild, sharp, or swap pepper jack for heat
- Optional for serving: avocado slices, guacamole, extra cheese, cilantro, salsa, or hot sauce
For exact quantities, see the recipe card below.
Make it yours.
- Make it lighter: swap thighs for boneless chicken breasts or use Greek yogurt instead of sour cream.
- Use taco seasoning if that’s what you have — both work well.
- Try steak or shrimp instead of chicken for a different protein.
- Cheese swaps: pepper jack for spice, Monterey Jack or a Mexican blend for extra melt.
- Dairy-free: use plant-based sour cream and dairy-free cheese.
- Spice it up with diced jalapeños or a pinch of cayenne.
How to make chicken fajita casserole.
This casserole is straightforward. Below is an overview; follow the printable recipe card for exact details.
Cook the chicken
In an ovenproof skillet, sauté chicken in olive oil over medium heat until cooked through. Remove and keep warm.
Cook the veg
Sauté sliced onions and peppers in the skillet until they reach your desired tenderness.
Mix
Add the cooked chicken back to the pan, then stir in fajita seasoning, sour cream, and softened cream cheese until combined.
Sprinkle and bake
Top with shredded cheddar and bake at 350°F until the cheese is bubbly and melted, about 10–15 minutes.
How do you cut chicken breast for chicken fajitas?
- Slice the breast into thin ½” strips across the grain for tender slices.
- Smaller pieces cook faster, so reduce cooking time as needed.
How to serve fajita chicken casserole.
Serving ideas for this chicken fajita casserole:
- Top with salsa and sour cream for classic flavor.
- Serve as-is for a low-carb, keto-friendly meal.
- Not low-carb? Serve with warm tortillas, rice, or beans.
- Spoon over cauliflower rice for a grain-free option.
- Wrap in low-carb or classic flour/corn tortillas for fajita-style wraps.
- Add a fresh side salad to balance the richness.
Toppings to try: extra shredded cheese, salsa, chipotle crema, roasted corn salsa, avocado, or hot sauce.
Love fajitas? Try other fajita-style recipes for soups, Instant Pot versions, or skillet fajitas to vary your menu.
Kori’s tips.
- Don’t overbake — most ingredients are already cooked; bake just until the cheese is bubbly for the best texture.
- Cut chicken into uniform pieces (about 1″ to 2″ or 1½” strips) for even cooking.
- Cook peppers and onions to your preferred tenderness — crisp-tender or soft.
- Ensure chicken reaches 165°F for safe serving.
- If you don’t have an ovenproof skillet, transfer the mixture to a greased casserole dish before baking.
FAQs
The USDA recommends cooking chicken to an internal temperature of 165ºF. Use an instant-read thermometer to check the thickest part of the chicken.
Chicken fajitas can be very healthy. They provide protein, healthy fats, and fiber from peppers and onions. Nutrient content varies by ingredients and portion size.
Fajitas without tortillas typically have low carbohydrate content; this casserole is approximately 9–10 grams of carbs per 1-cup serving, depending on exact ingredients.
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat gently to avoid separating the dairy.
Freezing is not recommended — peppers can become watery and dairy components may separate after thawing.
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📖 The recipe.
Chicken Fajitas Casserole (easy and cheesy!)
Pin Recipe
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)
- 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°F. Over medium heat, sauté the chicken in olive oil until cooked through. Remove from skillet and set aside.
-
Add onions and peppers to the skillet and sauté until they reach your preferred tenderness.
-
Return chicken to the pan and stir in fajita seasoning, sour cream, and cream cheese until well combined.
-
Sprinkle with shredded cheddar and bake 10–15 minutes, or until the cheese is melted and bubbly.
Video
Kori’s Tips
Substitutions: Use pre-cooked chicken to save time (about 5–6 cups).
Tip: If you don’t have an ovenproof skillet, transfer the finished mixture to a greased casserole dish before baking.
Serving suggestions: Top with avocado, guacamole, sour cream, or salsa; serve over rice or cauliflower rice, or in tortillas.
Nutrition
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