Making Chicken Fajita Casserole is a breeze! Just follow these steps:

1. Preheat the Oven: Set your oven to 375°F (190°C).
2. Sauté the Chicken: In a large skillet over medium heat, add the olive oil. Once hot, add the diced chicken. Sauté until it turns golden brown and is cooked through, about 5-7 minutes.
3. Add Vegetables: Stir in the sliced onions and bell peppers. Sauté for another 4-5 minutes until the vegetables are tender.
4. Incorporate Spices: Add the minced garlic, chili powder, cumin, paprika, salt, and black pepper. Cook for an additional minute, stirring to combine all flavors.
5. Combine Ingredients: Remove the skillet from the heat. Stir in the can of diced tomatoes (with juice) and corn until evenly mixed.
6. Layer the Casserole: In a greased 9×13-inch casserole dish, spread half of the chicken and vegetable mixture. Top with 1 cup of the shredded cheese. Add the remaining chicken mixture and sprinkle the remaining cheese on top.
7. Bake: Cover the casserole dish with foil and bake for 20 minutes. Then, remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden brown.
8. Garnish: Once baked, remove from the oven and let it cool for 5 minutes. Garnish with fresh cilantro if desired.

Following these instructions makes your Chicken Fajita Casserole a flavorful and satisfying meal the whole family will enjoy.