Fajita Chicken Casserole

If you are craving a dish that bursts with bold flavors and comforting warmth, this fajita chicken casserole featuring 1 lb boneless, skinless chicken breasts, cut into bite-sized pieces will quickly become your go-to favorite. Tender chicken mingles with sautéed onions and bell peppers, all drenched in creamy sour cream and zesty fajita seasoning, then topped with a gooey blend of cheddar and mozzarella cheeses. It is the perfect harmony of smoky, spicy, and cheesy goodness in every bite, making it a heartwarming weeknight winner or a crowd-pleasing potluck dish.

Ingredients You’ll Need

Each ingredient in this recipe is simple yet essential, playing a crucial role in bringing bright colors, rich textures, and robust flavors to your fajita chicken casserole.

• 1 lb boneless, skinless chicken breasts, cut into bite-sized pieces: The star protein that cooks quickly and soaks up all the delicious seasonings impeccably.
• 1 large onion, sliced: Adds sweetness and a slight crunch that balances the creaminess perfectly.
• 1 large bell pepper, sliced (any color): Brings vibrant color and fresh, mild heat for that classic fajita taste.
• 1 cup shredded cheddar cheese: Offers sharpness and melty richness on top.
• 1 cup shredded mozzarella cheese: Adds creamy stretchiness and mellow flavor to complement cheddar.
• 1 packet fajita seasoning mix: Packs in smoky, spicy, and aromatic notes that define this dish.
• 1 cup sour cream: Provides tangy creaminess to bind all the flavors together.
• 1/2 cup chicken broth: Keeps the casserole moist and flavorful while baking.
• 1 tbsp olive oil: For sautéing the chicken and veggies without sticking.
• Salt and pepper to taste: Essential for balancing and enhancing every ingredient.
• Fresh cilantro, chopped (optional, for garnish): Adds a fresh, herbal brightness to finish the dish beautifully.

How to Make Fajita Chicken Casserole

Step 1: Prepare Your Oven and Chicken

Start by preheating your oven to 375°F (190°C) so it’s ready to cook your casserole to perfection once assembled. Then, heat olive oil in a large skillet over medium-high heat to get a nice sizzle going. Add the 1 lb boneless, skinless chicken breasts, cut into bite-sized pieces and cook them until they are browned on all sides, about 5 to 7 minutes—this step seals in juices and locks in flavor.

Step 2: Sauté the Onions and Peppers

Next, toss in the sliced onion and bell pepper right alongside the chicken. Cook together for another 4 to 5 minutes to soften the veggies while letting their natural sweetness develop. This combo is the heart of fajita flavor that will make your casserole extra delicious.

Step 3: Season and Mix

Sprinkle the fajita seasoning evenly over the chicken and vegetables. Stir everything well so the seasoning coats each piece, turning this dish into a flavor-packed feast. In a small bowl, whisk together the sour cream and chicken broth until smooth—this luscious sauce makes the casserole delightfully creamy.

Step 4: Assemble and Bake

Pour the sour cream and broth mixture over the skillet contents, giving everything a good stir to fully combine. Transfer this mixture into your baking dish, then generously top it with shredded cheddar and mozzarella cheeses. Now bake for 20 to 25 minutes until the cheese is melted, bubbly, and golden, creating that irresistible crust we all love.

How to Serve Fajita Chicken Casserole

Garnishes

After you pull your casserole out of the oven, sprinkle fresh chopped cilantro on top. This simple garnish adds a fresh, vibrant aroma and a pop of green that brightens every cheesy, creamy bite.

Side Dishes

Serve with fluffy white rice, warm tortillas, or a crisp green salad to complement the rich fajita chicken casserole. Each side helps balance the dish, providing extra texture and freshness that round out your meal beautifully.

Creative Ways to Present

For a fun twist, scoop the casserole into small ramekins or tortilla bowls for individual servings. You can also layer it over baked potatoes or stuffed peppers for an eye-catching dinner presentation that impresses family or guests.

Make Ahead and Storage

Storing Leftovers

Once cooled, place any leftover fajita chicken casserole in an airtight container and refrigerate. It will stay fresh and flavorful for up to 3 days, making it an effortless meal to enjoy later in the week.

Freezing

This dish freezes wonderfully! Just transfer cooled leftovers to freezer-safe containers or heavy-duty bags and freeze for up to 2 months. When ready to eat, thaw overnight in the fridge before reheating.

Reheating

Reheat your casserole in the oven at 350°F (175°C) until warmed through, about 15 to 20 minutes, or microwave individual portions for 2 to 3 minutes. Adding a sprinkle of extra cheese during reheating keeps it nice and gooey.

FAQs

Can I use chicken thighs instead of 1 lb boneless, skinless chicken breasts, cut into bite-sized pieces?

Absolutely! Chicken thighs offer a richer flavor and stay moist even longer, which can add extra juiciness to your fajita casserole. Just make sure to cut them into similarly sized pieces for even cooking.

What if I don’t have fajita seasoning mix on hand?

No worries! You can make your own with a blend of chili powder, cumin, paprika, garlic powder, onion powder, oregano, salt, and pepper. This DIY mix will deliver the same smoky, spicy notes perfectly.

Is it possible to make this recipe dairy-free?

Definitely. Use dairy-free sour cream and plant-based cheeses, or simply omit the cheese topping and enjoy a lighter version that still captures all the fajita flavors.

Can I prepare this casserole in advance for a potluck?

Yes, assembling everything ahead of time and refrigerating it before baking is a great way to save time. Just bake it fresh before serving to get that lovely golden cheese crust.

How spicy is this fajita chicken casserole?

The heat level depends on the fajita seasoning you use—most are mildly spicy but flavorful. You can adjust by adding extra chili powder for more kick or omitting it for a milder dish.

Final Thoughts

This fajita chicken casserole, made with 1 lb boneless, skinless chicken breasts, cut into bite-sized pieces, is a true crowd-pleaser that delivers comforting flavors with minimal fuss. It’s a dish you’ll happily make again and again, bringing warmth and joy to any table. I can’t wait for you to try it and make it your new favorite!

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