In a large mixing bowl, combine the shredded chicken, salsa, black beans, corn, salt, garlic powder, and cumin. Stir thoroughly until the mixture is well blended.
Transfer the mixture into a spacious casserole dish, spreading it out evenly to create a uniform layer.
Evenly sprinkle the shredded cheese across the surface of the casserole.
Place the dish into a preheated oven at 350˚F and bake for 20–25 minutes, or until the cheese has melted and the casserole is heated through.
Remove from the oven and allow to cool slightly. Finish with optional garnishes such as sour cream, guacamole, and green onions before serving.