Chicken Fajita Casserole

If you love the bold, sizzling flavors of chicken fajitas but don’t want to deal with multiple skillets and a messy stovetop, this Chicken Fajita Casserole is your new BFF.

It takes everything you love about fajitas—juicy seasoned chicken, colorful bell peppers, onions, and melty cheese—and bakes it all in one easy dish. No need to stand over a hot stove flipping chicken while your veggies cook separately. This casserole is a fuss-free, hands-off way to enjoy fajitas without sacrificing any of the flavor.

This dish is perfect for meal prep because it reheats beautifully, making it a great option for busy weeknights or packed lunches.

Plus, it’s easy to customize! Want it spicier? Add extra jalapeños. Watching your carbs? Skip the tortillas and serve it over cauliflower rice or lettuce wraps.

Whether you’re feeding the whole family or just looking for a quick and satisfying dinner, this casserole delivers on both taste and convenience.

Why You’ll Love This Recipe

✔ One-Dish Wonder – No need for multiple pans or messy stovetop cooking. Just layer, bake, and enjoy!
✔ Packed with Protein – Juicy chicken breast provides a high-protein meal that keeps you full.
✔ Easy to Customize – Adjust the spice level, add extra veggies, or swap out the cheese for a dairy-free option.
✔ Great for Meal Prep – Make ahead and enjoy throughout the week. It reheats beautifully!
✔ Low-Carb & Gluten-Free Friendly – Skip the tortillas and serve it over greens or rice for a keto-friendly version.

Ready to Dive In? Here’s the Easy Chicken Fajita Casserole Recipe

Ingredients

1 ½ lbs boneless, skinless chicken breasts, cut into strips
1 red bell pepper, sliced
1 yellow bell pepper, sliced
1 green bell pepper, sliced
1 small red onion, sliced
2 tbsp olive oil
1 tbsp fajita seasoning (store-bought or homemade)
1 tsp smoked paprika
1 tsp garlic powder
½ tsp salt
½ tsp black pepper
1 cup shredded Mexican cheese blend
½ cup diced tomatoes (optional, for extra juiciness)
½ cup sour cream or Greek yogurt (for serving)
Fresh cilantro, for garnish
Lime wedges, for serving

Instructions

Preheat oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish.
In a large bowl, toss the chicken strips, bell peppers, and onion with olive oil, fajita seasoning, smoked paprika, garlic powder, salt, and black pepper until evenly coated.
Transfer everything to the baking dish, spreading it out in an even layer.
Bake uncovered for 25-30 minutes, or until the chicken is fully cooked and the veggies are tender.
Sprinkle shredded cheese over the top and bake for another 5 minutes, or until the cheese is melted and bubbly.
Remove from the oven, garnish with fresh cilantro and lime wedges, and serve with sour cream or Greek yogurt.

Nutritional Info (per serving, serves 6):

✅ Calories: ~280 | Protein: ~32g | Carbs: ~8g | Fat: ~12g

Tips for the Best Chicken Fajita Casserole

🔥 Marinate for More Flavor – If you have extra time, toss the chicken with the seasoning and a squeeze of lime juice, then let it marinate in the fridge for 30 minutes before baking. This deepens the flavor and keeps the chicken extra juicy.

🧀 Choose the Right Cheese – A Mexican cheese blend melts beautifully, but if you love a stronger, smokier flavor, try using pepper jack or smoked cheddar.

🌶️ Make It Spicier – Want more heat? Add diced jalapeños to the mix or sprinkle in a little cayenne pepper with the seasoning.

🥑 Delicious Toppings & Add-Ons – Serve this casserole with sliced avocado, guacamole, extra salsa, or crushed tortilla chips for added texture and flavor.

🥘 Serving Ideas –

For low-carb, serve over cauliflower rice or in lettuce wraps.
For a heartier meal, stuff into tortillas for easy fajita tacos.
Try it over a bed of quinoa or brown rice for a high-protein meal prep option.