Preheat your oven to 350°F (175°C).
In a large mixing bowl, combine the shredded chicken, enchilada sauce, black beans, corn, diced tomatoes, cumin, garlic powder, onion powder, and chili powder. Mix well until all ingredients are evenly coated.
In a greased 9x13-inch baking dish, layer half of the tortilla strips on the bottom.
Spread half of the chicken mixture over the tortilla layer, followed by half of the shredded cheese.
Repeat the layers with the remaining tortilla strips, chicken mixture, and top with the remaining cheese.
Cover the baking dish with aluminum foil and bake for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.
Let the casserole cool for 5-10 minutes before serving. Top with sour cream and cilantro if desired.