Mix the garlic powder, cumin, salt and pepper and set aside.
Combine the corn, black beans, green chiles, red bell pepper, and chopped cilantro and mix well.
In a large casserole dish, lay the chicken breast flat in the baking dish. Sprinkle with seasonings, then spread the corn mixture evenly over it. Add cheese to top it off.
Bake uncovered at 375˚F for 40-50 minutes or until the chicken has an internal temperature of 160˚F. If the cheese starts to get too brown for your liking, loosely cover with foil for the remainder of the cook time.