Preheat the oven to 375°F (190°C) and coat a 9x13 inch baking dish with non-stick cooking spray.
In a large bowl, combine shredded chicken, black beans, corn, diced onion, cumin, garlic powder, and salt. Mix thoroughly.
Spread 1/4 cup of enchilada sauce on the bottom of the prepared baking dish.
Layer one-third of the tortilla strips over the sauce, followed by half of the chicken mixture and 1/2 cup of cheese.
Repeat the layer with another third of the tortillas, the remaining chicken mixture, and 1/2 cup of cheese.
Place the final layer of tortilla strips on top, then pour the remaining enchilada sauce evenly over the surface.
Top with the remaining 1 cup of cheese.
Bake for 25 to 30 minutes until the cheese is bubbling and the edges are lightly browned.
Let the casserole rest for 5 to 10 minutes before slicing to allow the layers to set.