Fajita Chicken Casserole
There are some dinners that make everyone happy the moment they hit the table, and this Fajita Chicken Casserole is definitely one of them.
It’s packed with tender seasoned chicken, colorful bell peppers, onions, creamy sauce, and plenty of melted cheese. Everything is baked together until hot, bubbly, and golden on top.
I first made this on a busy weekend when I was craving fajitas but didn’t feel like standing over a hot skillet cooking everything separately. I had chicken and vegetables ready to go, so I decided to turn the whole thing into a casserole instead.
It was such a good decision.
The kitchen smelled like sizzling fajitas while the casserole baked, and when I pulled it from the oven, the cheese was bubbling around the edges. Everyone came into the kitchen asking when dinner would be ready.
We ended up serving it with a simple salad and avocado, and there wasn’t much left by the end of the meal.
Now this is one of those recipes I make whenever I want the flavors of fajitas in an easy, comforting dinner.
Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 45 minutes
Servings: 6
Why You’ll Love This Fajita Chicken Casserole
- Easy one-dish dinner
- Cheesy and comforting
- Packed with tender chicken
- Colorful bell peppers
- Great for busy weeknights
- Easy to customize
- Family-friendly
- Perfect for meal prep
Ingredients
For the Chicken
- 700 g boneless, skinless chicken breasts or thighs
- 1 tablespoon olive oil
- 1½ teaspoons chili powder
- 1 teaspoon paprika
- 1 teaspoon cumin
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- ½ teaspoon salt
- ¼ teaspoon black pepper
For the Casserole
- 1 red bell pepper, sliced
- 1 green bell pepper, sliced
- 1 yellow bell pepper, sliced
- 1 medium onion, sliced
- 2 cloves garlic, minced
- 115 g cream cheese, softened
- ½ cup sour cream
- ½ cup chicken broth
- 1 cup shredded cheddar cheese
- 1 cup shredded Monterey Jack or Mexican cheese blend
- 2 tablespoons chopped fresh cilantro
- 1 tablespoon fresh lime juice
Optional Toppings
- Sliced avocado
- Fresh cilantro
- Jalapeños
- Diced tomatoes
- Sour cream
- Lime wedges
- Sliced green onions
Instructions
Step 1: Preheat the Oven
Preheat your oven to 190°C (375°F).
Lightly grease a 9×13-inch baking dish.
Step 2: Season the Chicken
Cut the chicken into bite-sized pieces.
Place it in a bowl and add olive oil, chili powder, paprika, cumin, garlic powder, onion powder, salt, and black pepper.
Toss until the chicken is evenly coated.
Step 3: Cook the Chicken
Heat a large skillet over medium-high heat.
Add the seasoned chicken and cook for approximately 5–7 minutes, stirring occasionally, until lightly browned and nearly cooked through.
Transfer the chicken to a plate.
It doesn’t need to be completely cooked at this point because it will finish cooking in the oven.
Step 4: Cook the Vegetables
Add the sliced peppers and onion to the same skillet.
Cook for 4–5 minutes, stirring occasionally.
Add the garlic and cook for another 30 seconds.
The vegetables should be slightly softened but still have some texture.
Step 5: Make the Creamy Sauce
Reduce the heat to low.
Add the cream cheese, sour cream, and chicken broth to the skillet.
Stir until the cream cheese melts and everything becomes smooth and creamy.
Add the lime juice and half of the cilantro.
Taste and adjust the seasoning if needed.
Step 6: Assemble the Casserole
Return the cooked chicken to the skillet and stir everything together.
Transfer the mixture to the prepared baking dish.
Spread it into an even layer.
Step 7: Add the Cheese
Sprinkle the cheddar and Monterey Jack evenly over the top.
Don’t be shy with the cheese—those golden, bubbling edges are one of the best parts!
Step 8: Bake
Bake uncovered for approximately 20–25 minutes, or until the chicken is completely cooked and the cheese is melted and bubbling.
For an extra golden top, broil for 1–2 minutes at the end while watching carefully.
Step 9: Garnish and Serve
Remove from the oven and let the casserole rest for about 5 minutes.
Sprinkle with fresh cilantro and add your favorite toppings.
Serve warm with lime wedges.
My Best Tips
Don’t Overcook the Chicken
Because the chicken gets additional cooking time in the oven, avoid cooking it too long in the skillet.
Use Colorful Peppers
Red, yellow, and green peppers don’t just make the casserole beautiful—they also give it a wonderful combination of sweet and savory flavors.
Don’t Skip the Lime
Fresh lime juice cuts through the creamy cheese and adds brightness to the whole dish.
Let It Rest
Give the casserole a few minutes after baking. This helps the sauce thicken slightly and makes it easier to serve.
Delicious Variations
Spicy Fajita Casserole
Add diced jalapeños or a pinch of cayenne to the chicken seasoning.
Low-Carb Fajita Casserole
Serve the casserole on its own with avocado, salad, or roasted vegetables instead of rice or tortillas.
Fajita Chicken and Rice Casserole
Add cooked rice before baking for a heartier meal.
Black Bean Fajita Casserole
Stir in drained black beans for extra fiber and texture.
Chicken and Corn Fajita Casserole
Add corn for a touch of sweetness.
Extra Cheesy Fajita Casserole
Add another layer of cheese during the final few minutes of baking.
What to Serve with Fajita Chicken Casserole
Try serving it with:
- Avocado
- Guacamole
- Fresh salsa
- Mexican-style cauliflower rice
- Green salad
- Roasted vegetables
- Cilantro-lime rice
- Black beans
- Tortilla chips
- Warm tortillas
For a lighter meal, I love serving it with avocado and a crisp tomato-cucumber salad.
Make-Ahead Instructions
You can assemble the casserole up to 1 day ahead.
Cover tightly and refrigerate.
When ready to bake, remove it from the refrigerator while the oven preheats and add a few extra minutes to the baking time if needed.
For the best texture, add the cheese shortly before baking.
Storage Instructions
Store leftovers in an airtight container in the refrigerator for up to 3–4 days.
Reheat individual portions in the microwave or reheat the whole casserole gently in the oven.
Freezing
The casserole can be frozen, although the creamy sauce may change texture slightly after thawing.
Cool completely, portion into freezer-safe containers, and freeze.
Thaw overnight in the refrigerator before reheating.
Nutritional Information
Approximate per serving:
- Calories: 460
- Protein: 42g
- Fat: 29g
- Total Carbohydrates: 10g
- Fibre: 2g
- Net Carbohydrates: 8g
Nutrition values are estimates and will vary depending on the chicken, cheese, and other ingredients used.
Frequently Asked Questions
Can I use chicken thighs?
Absolutely. Chicken thighs are especially juicy and flavorful and work beautifully in this casserole.
Can I use pre-cooked chicken?
Yes. Shredded or chopped cooked chicken can be used. Simply sauté the vegetables, make the sauce, combine everything, and reduce the baking time because the chicken is already cooked.
Can I make this casserole without cream cheese?
Yes. You can increase the sour cream slightly or use Greek yogurt for a lighter variation. The texture will be somewhat different.
Can I make it keto?
Yes. The basic casserole is relatively low in carbohydrates. Serve it with low-carb sides such as cauliflower rice, avocado, or a green salad.
Can I add beans?
Yes. Black beans or pinto beans make a hearty addition, although they will increase the carbohydrate content.
Can I use store-bought fajita seasoning?
Definitely. Use approximately 1½–2 tablespoons, depending on the brand and your preferred flavor. Check the ingredient label if you’re watching sodium or added carbohydrates.
Final Thoughts
This Fajita Chicken Casserole has everything I love about fajitas without all the work of cooking each ingredient separately.
The seasoned chicken is tender, the peppers and onions bring that classic fajita flavor, and the creamy sauce ties everything together under a blanket of melted cheese.
I especially love making this when the family is hungry and I need something dependable. It goes from skillet to baking dish to table without creating a mountain of dishes.
And when everyone goes back for seconds, you know you’ve found a keeper. 🌶️🧀🍗