Keto Chicken Fajita Casserole (Easy One-Pan Low-Carb Dinner)

This flavor-packed keto chicken fajita casserole brings the sizzle of Mexican cuisine to your dinner table while keeping it low-carb and gluten-free.

Modern kitchen scene with raw ingredients for chicken fajita preparation, including sliced chicken, bell peppers, onions, and cheese, arranged on marble countertop in natural daylight.

KEY INFO

Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 45 minutes
Servings: 6-8
Difficulty: Easy
Dietary: Keto, Low-Carb, Gluten-Free

NUTRITION PER SERVING

Calories: 385
Fat: 28g
Protein: 32g
Net Carbs: 4g

EQUIPMENT NEEDED

9×13 inch baking dish (or large cast-iron skillet)
Large frying pan
Sharp knife
Cutting board
Measuring spoons

INGREDIENTS

For the Chicken:

2 lbs chicken breast or thighs, sliced (900g)
¼ cup avocado oil (60ml) [or olive oil]
3 tbsp fajita seasoning (45g)

For the Vegetables:

2 bell peppers, sliced (any color)
1 large onion, sliced
8 oz cream cheese, softened (225g)
2 cups shredded cheddar cheese (200g) [or Mexican blend]

METHOD

Preheat oven to 350°F (175°C)
Season chicken strips with 2 tbsp fajita seasoning and a pinch of salt
Heat oil in a large pan over medium-high heat
Cook chicken until golden brown (4-5 minutes per side)
*Look for no pink in the middle*

Golden-brown chicken strips cooking in a cast iron skillet in a modern kitchen with green subway tile backsplash and warm lighting

Remove chicken, set aside
In the same pan, cook peppers and onions until tender (5-7 minutes)

Sautéed bell peppers and onions in skillet on modern white marble kitchen counter with green subway tile backsplash

Return chicken to pan, add cream cheese and remaining seasoning
Transfer to baking dish, top with shredded cheese

Chicken and vegetables in a 9x13 baking dish, ready for the oven in a modern kitchen with green subway tile backsplash and copper pots

Bake for 25-30 minutes until bubbly and cheese is melted

Baked casserole with golden-brown melted cheese in a modern kitchen with green subway tiles and cream-colored ceramic bowls

CRUCIAL TIPS

Let cream cheese come to room temperature before using
Don’t overcrowd the pan when cooking chicken
Use pre-shredded cheese for easier prep
Check chicken temperature reaches 165°F (74°C)

STORAGE & REHEATING

Keeps in fridge: 4 days
Freezer: Up to 3 months
Reheat: 350°F for 15 minutes or microwave until hot

VARIATIONS

1. Spicy Version:

Add 1-2 diced jalapeños
Use pepper jack cheese

2. Crockpot Method:

Cook on low 6-8 hours
Add cheese last 30 minutes

3. Extra Creamy:

Add ½ cup sour cream
Mix in extra cheese

COMMON MISTAKES TO AVOID

Don’t skip pre-cooking the vegetables
Avoid watery bell peppers (pat dry after washing)
Don’t rush the cheese melting process

This keto-friendly fajita casserole is perfect for meal prep and family dinners. Each bite delivers the perfect balance of spicy, creamy, and cheesy flavors while keeping those carbs in check.