Making Chicken Fajita Casserole follows a simple process that even beginner cooks can easily handle. Here’s how to do it:

1. Preheat Oven: Start by preheating your oven to 350°F (175°C).
2. Cook Chicken: In a large skillet, heat the olive oil over medium heat. Add diced chicken, season with salt, pepper, and taco seasoning. Cook until no longer pink, about 5-7 minutes.
3. Add Vegetables: Add the sliced bell pepper and onion to the skillet. Cook for another 5 minutes until the vegetables soften.
4. Mix Other Ingredients: In a large mixing bowl, combine the black beans, corn, and diced tomatoes. Stir in the cooked chicken and vegetable mixture.
5. Layering: In a greased 9×13-inch baking dish, layer half of the crushed tortilla chips. Pour half of the chicken mixture on top, followed by half of the sour cream. Sprinkle half of the shredded cheese on top.
6. Repeat Layers: Repeat the layering process with the remaining chips, chicken mixture, sour cream, and cheese.
7. Bake: Place the baking dish in the preheated oven and bake for 30-35 minutes until the cheese is bubbly and golden.
8. Rest: After removing from the oven, let the casserole rest for about 5-10 minutes. This allows the layers to set.
9. Garnish: Before serving, garnish with fresh cilantro if desired.

This step-by-step guide will lead you in creating a hearty Chicken Fajita Casserole that your whole family will love!