Creating Chicken Enchilada Casserole can be straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Sauté Vegetables: In a large skillet, heat olive oil over medium heat. Add diced onion and bell peppers, sauté until softened (about 5 minutes).
3. Combine Ingredients: In a large bowl, mix the shredded chicken, enchilada sauce, black beans, corn, sautéed vegetables, chili powder, cumin, garlic powder, salt, and black pepper.
4. Layer the Casserole: In a greased 9×13-inch baking dish, spread a layer of tortilla strips. Top with half of the chicken mixture, then sprinkle with 1 cup of cheese.
5. Repeat Layers: Add another layer of tortilla strips, followed by the remaining chicken mixture. Top with another layer of tortilla strips and the remaining cheese.
6. Bake: Cover the dish with foil and bake for 20 minutes. Remove the foil and bake for an additional 10-15 minutes until the cheese is bubbly and golden.
7. Cool: Allow the casserole to cool for a few minutes before serving.
8. Garnish: Optionally, sprinkle with fresh cilantro for added flavor and color.

These steps will guide you in creating this incredible casserole effortlessly.