This Chicken Fajita Casserole is the ultimate one-pan meal that brings all the sizzling flavor of your favorite fajitas into a simple, cheesy, and incredibly satisfying bake. If you’re looking for a quick weeknight dinner that the whole family will love, you’ve found it. We’re talking tender chicken, sweet bell peppers, and savory onions all baked together under a glorious layer of melted cheese. It’s a guaranteed crowd-pleaser that’s as easy to make as it is delicious.
Forget juggling multiple pans and tortillas. This recipe streamlines the entire process into a single baking dish, making both cooking and cleanup an absolute breeze. Perfect for busy evenings, this dish delivers maximum flavor with minimal effort.
Simple, fresh ingredients are all you need.
Why This Chicken Fajita Casserole Recipe is a Weeknight Winner
There are so many reasons to love this easy Chicken Fajita Casserole. It’s a versatile dish that checks all the boxes for a perfect family meal.
Quick & Easy: With simple prep and about 30 minutes of bake time, you can have a hot, delicious dinner on the table in under an hour. It’s a true set-it-and-forget-it meal.
Packed with Flavor: A simple blend of fajita spices coats every piece of chicken and veggie, infusing the entire casserole with a smoky, savory, and slightly spicy taste.
Customizable: This recipe is a fantastic starting point. You can easily adjust the spice level, swap in your favorite veggies, or make it low-carb to fit your dietary needs.
Family-Friendly: The combination of seasoned chicken, sweet peppers, and gooey cheese is a home run with both kids and adults. It’s a great way to get everyone to eat their vegetables! Looking for another family favorite? Try these amazing Buffalo Chicken Sliders.
Ingredients You’ll Need
The beauty of this recipe is its simplicity. You only need a handful of fresh ingredients to create a truly memorable meal.
Chicken Breast: Boneless, skinless chicken breasts cut into 1-inch cubes are perfect. They cook quickly and absorb all the delicious seasonings.
Bell Peppers: A colorful mix of red, yellow, and green bell peppers adds sweetness and classic fajita flavor.
Onion: A yellow or red onion provides a savory, aromatic base.
Fajita Seasoning: You can use a store-bought packet or make your own blend with chili powder, cumin, paprika, garlic powder, and oregano.
Mexican Cheese Blend: A pre-shredded blend of Monterey Jack, Cheddar, and Colby melts beautifully and adds the perfect cheesy topping.
Optional Toppings: Sour cream, fresh cilantro, sliced avocado, or your favorite salsa.
Look at that cheesy perfection!
How to Make The Best Chicken Fajita Casserole
Making this cheesy chicken fajita bake is incredibly straightforward. Just follow these simple steps for a perfect result every time.
Step 1: Prep Your Veggies and Chicken
First, preheat your oven to 400°F (200°C). While it heats up, slice your bell peppers and onion into thin strips. Cut the boneless, skinless chicken breasts into bite-sized 1-inch pieces. This ensures everything cooks evenly.
In a large skillet, heat the olive oil over medium-high heat. Add the chicken pieces and cook until they are lightly browned. Add the sliced peppers and onions to the skillet. Sprinkle everything generously with the fajita seasoning and stir well to coat. Cook for 5-7 minutes, until the vegetables are tender-crisp.
Step 3: Assemble the Casserole
Transfer the chicken and vegetable mixture from the skillet into a 9×13-inch baking dish. Spread it out into an even layer. This simple casserole comes together so quickly, just like these Jalapeno Popper Pinwheels for a fun appetizer.
Step 4: Bake to Perfection
Sprinkle the shredded Mexican cheese blend evenly over the top of the chicken and veggie mixture. Bake for 20-25 minutes, or until the cheese is completely melted, bubbly, and slightly golden on top. Let it rest for a few minutes before serving.
Tips for Success
For the best possible Chicken Fajita Casserole, keep these simple tips in mind.
Use Freshly Shredded Cheese: While pre-shredded is convenient, shredding a block of cheese yourself results in a smoother, creamier melt because it doesn’t contain anti-caking agents.
Let it Rest: Allowing the casserole to rest for about 5 minutes after it comes out of the oven lets it set, making it much easier to serve.
Customization and Variations
One of the best things about this recipe is how easy it is to adapt. Here are a few ideas to make it your own.
Make it Low-Carb or Keto
This recipe is naturally low in carbs! To keep it keto-friendly, serve it as is or with cauliflower rice. Ensure your fajita seasoning is sugar-free.
Add Different Veggies
Feel free to add other vegetables to the mix. Mushrooms, zucchini, or even black beans (if not low-carb) would be delicious additions. For more inspiration on easy weeknight meals, check out our collection of quick chicken dinner ideas.
Spice it Up
If you like a little heat, add a pinch of cayenne pepper to your seasoning mix or toss in some sliced jalapeños with the bell peppers.
What to Serve with Your Casserole
This Chicken Fajita Casserole is a fantastic meal on its own, but it also pairs well with a variety of sides. Serve it over cilantro-lime rice, quinoa, or cauliflower rice. You can also offer warm tortillas on the side for scooping. A dollop of sour cream, guacamole, or fresh pico de gallo on top is always a great choice.
Storage and Reheating Instructions
This casserole makes for fantastic leftovers! Store any extra portions in an airtight container in the refrigerator for up to 4 days. To reheat, simply microwave individual portions until warmed through, or place the casserole back in the oven at 350°F (175°C) until bubbly.
Frequently Asked Questions About Chicken Fajita Casserole
Yes! You can assemble the entire casserole without baking it, then cover and refrigerate for up to 24 hours. When you’re ready to eat, just add a few extra minutes to the baking time.
Absolutely. The recipe as written is naturally low in carbohydrates. Serve it as is or with a side of cauliflower rice to make it a perfect keto-friendly meal.
A Mexican cheese blend is ideal as it contains a mix of good melting cheeses like Monterey Jack and Cheddar. For the best results, we recommend shredding your own cheese from a block to avoid anti-caking agents.
Store any leftovers in an airtight container in the refrigerator for up to 4 days. You can reheat individual portions in the microwave or the entire dish in the oven at 350°F (175°C) until heated through.
This dish is very versatile. It’s delicious on its own, or you can serve it with cilantro-lime rice, warm tortillas, sour cream, guacamole, and salsa.
More Delicious Recipes to Try
If you loved this simple and flavorful casserole, we know you’ll enjoy exploring more of our recipes. We hope this becomes one of your go-to easy chicken dinners. Let us know what you think in the comments below, and don’t forget to save this recipe to your Pinterest board!
This easy Chicken Fajita Casserole is a weeknight game-changer!
Chicken Fajita Casserole Recipe
FL Recipes
Chicken Fajita Casserole (The Easiest, Cheesy Bake!)
This Chicken Fajita Casserole brings all the sizzling flavor of your favorite fajitas into a simple, cheesy, and incredibly satisfying bake. A perfect, easy weeknight dinner the whole family will love, ready in under an hour!
2lbsboneless, skinless chicken breastscut into 1-inch cubes
3bell peppers (assorted colors)thinly sliced
1largeyellow onionthinly sliced
2tbspolive oil
3tbspfajita seasoningfrom one 1-oz packet or homemade
2cupsshredded Mexican cheese blend
Optional toppings: sour cream, cilantro, avocado
Equipment
1 9x13 inch Baking Dish
1 Large Skillet
Method
Preheat your oven to 400°F (200°C).
Heat olive oil in a large skillet over medium-high heat. Add the cubed chicken and cook for 3-4 minutes, until lightly browned.
Add the sliced bell peppers and onion to the skillet. Sprinkle with fajita seasoning and stir to combine. Cook for 5-7 minutes, until vegetables are tender-crisp.
Transfer the chicken and vegetable mixture to a 9x13-inch baking dish and spread into an even layer.
Top evenly with the shredded Mexican cheese blend.
Bake for 20-25 minutes, until the cheese is melted and bubbly. Let stand for 5 minutes before serving.
Nutrition
Calories: 450kcalProtein: 45gFat: 25gFiber: 2g
Notes
For best results, use freshly shredded cheese for a smoother melt. Store leftovers in an airtight container in the fridge for up to 4 days.
Hi, I’m Emily Carter, and welcome to FL Recipes! I share simple, healthy recipes that make cooking easy, fun, and delicious for everyone. more about me »
