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If you’re a fan of chicken fajitas, you’re going to love my creamy, cheesy Chicken Fajita Casserole. It’s loaded with tender chicken, colorful peppers, smoky cheese, and all those bold Tex-Mex flavors you crave—baked together into one irresistible, family-friendly dish!

Why this recipe is so delicious: it captures everything you love about sizzling fajitas—without the stovetop splatter or extra dishes. Juicy chicken, charred peppers, melty cheese, and a little spice come together for a cozy, crowd-pleasing dinner that’ll make fajita night easier than ever.

If you love bold, flavorful Tex-Mex casseroles, try a few of my other favorites while you’re here—like Taco Casserole (a layered family favorite with tons of flavor), Mexican Chicken Casserole (creamy, cheesy comfort with a kick), Green Chicken Enchilada Casserole (reader-favorite and freezer-friendly), or One Pot Burrito Bowl (all the flavor of a burrito in a single skillet!).

💗 Let’s bake up something delicious, friends!

✨ Before You Begin

✨ Slice the peppers evenly so they cook at the same rate and get that perfect char.
✨ Don’t skip sautéing in batches—it helps everything caramelize beautifully.
✨ Smoked cheddar adds deep flavor; if you prefer milder cheese, sub in Monterey Jack.
✨ Let the casserole rest before serving—it thickens slightly and slices cleanly.
✨ Garnish just before serving with avocado, tomatoes, or a dollop of sour cream for freshness.

Easy Chicken Fajita Casserole Ingredients

Oil: Any neutral-flavored oil will work.
Bell Peppers: I like to use the red, orange, or yellow peppers.
Poblano Chili: This is considered to be a fairly mild pepper. Most of the heat in the peppers is found in the ribs and seeds. Remove them or include them, depending on your family’s heat tolerance.
Onion: Use yellow, white, or red onion.
Green Chiles: Add these straight from the can with their juices.
Fajita Seasoning Mix: Use one envelope.
Garlic Powder: Adds just the right amount of garlic flavor.
Chicken: I like to use rotisserie chicken for this recipe.
Cream Cheese: Cube the cream cheese while it’s cold, then allow it to come to room temp.
Jack Cheese: I love the combo of these two cheeses in this casserole. If your family likes some heat, use pepper jack in place of the plain jack.
Smoked Cheddar Cheese: Smoked cheddar is available in the deli section of most supermarkets. I got mine from Walmart. I love the mild smokiness it brings to the dish.
Cilantro: I love the color, flavor, and freshness this adds to the casserole.

⭐ Pro Tips

⭐ Char = flavor! Let the peppers get some dark spots—they bring that “grilled fajita” flavor to the casserole.
⭐ Use room-temperature cream cheese. It blends more smoothly and evenly.
⭐ Make it ahead. Assemble up to 24 hours ahead, cover, and refrigerate. Just bake when you’re ready to serve.
⭐ Broil with care. Keep an eye out—the cheese browns fast under the broiler.
⭐ Add heat! If you like things spicy, add diced jalapeños or use pepper jack cheese.

How to Make Chicken Fajita Casserole

Heat a large skillet over medium-high heat and sauté the bell peppers, poblano, and onion in oil until soft and slightly charred, about 5 minutes. Then pour in the green chiles (with their juices), fajita seasoning, garlic, and salt. Stir and cook for about a minute until fragrant, then remove from heat. Stir in the cooked chicken and set aside.
In a large bowl, add and stir together the cream cheese, white cheddar, smoked cheddar, and a pinch of salt until smooth. Add the pepper and chicken mixture, stirring until everything is evenly coated. Spoon the mixture into your prepared baking dish and sprinkle the top with the remaining cheeses.
Pop the dish in the oven and bake, uncovered, until bubbly and the cheese has melted.
Switch over the oven to broil and give the casserole a few more minutes to brown up.
Set the casserole on the counter to rest about 10 minutes before cutting. Cut and plate and pass your favorite topping!

***See the full instructions below.

✦ Frequently Asked Questions

✦ Can I use chicken thighs instead of breasts?

Absolutely! Thighs stay juicy and flavorful—just cook them through before adding to the casserole.

✦ Can I make this casserole low-carb?

Yes! Simply skip the beans, rice, or tortillas on the side. It’s naturally keto-friendly as is.

✦ Can I freeze Chicken Fajita Casserole?

Definitely—just assemble, wrap tightly in plastic and foil, and freeze up to 2 months. Thaw overnight in the fridge before baking.

✦ What kind of cheese works best?

Smoked cheddar adds depth, while Monterey Jack gives that classic creamy melt. Use both for best results!

Still have questions? Drop them in the comments — I love helping you cook with confidence! 💗

Storing + Reheating + Freezing + Make-Ahead Tips

Storing

Keep leftovers in an airtight container in the refrigerator for up to 4 days.

Reheating

Cover with foil and reheat in a 350°F oven for 15–20 minutes until warmed through. If stored in a glass or ceramic dish, let it come to room temperature first.

Freezing

Cool completely, wrap well, and freeze for up to 2 months. Thaw overnight and bake until bubbly and hot.

Make-Ahead

Assemble the casserole, cover tightly, and refrigerate for up to 24 hours before baking.

What to Serve With Fajita Casserole

Bright sides like Southwest Salad, Mexican corn salad, Dorito Taco Salad, or Pineapple Coleslaw!

Cozy sides like Jalapeno Cornbread , Charro Beans, or Mexican Rice.

Finish with a sweet treat—Pineapple Upside Down Cake, Fudge Pie, Brownie Cookies, or Pig Pickin’ Cake.

More Tex-Mex Favorites

White Chicken Enchiladas – My top-rated classic!
Dorito Casserole– Layers of seasoned beef, creamy sauce, melty cheese, and crunchy Doritos.
Taco Spaghetti – A fun mashup of two family faves.
Mexican Tater Tot Casserole – Cheesy, beefy, and irresistible.
Honey Lime Enchiladas – Tender chicken wrapped in tortillas, smothered in a tangy honey-lime sauce, and baked with melty cheese for a sweet-meets-savory twist!
Chili Relleno Casserole – Creamy, cheesy, and full of flavor.

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Thanks for stopping by my kitchen today — happy cooking, friends! ❤️ Kathleen