Lay the chicken breasts flat in a pyrex dish.
Spread the corn and black beans evenly over the chicken.
Pour the enchilada sauce over the top of everything.
Spread the cheese over the top.
Bake uncovered on the middle rack at 350?F for 40-50 minutes or until chicken is no longer pink.
When the dish is done serve hot over tortillas or a bed of rice.
Garnish with sour cream and chopped cilantro.