Boil 3 c. water. Mix remaining ingredients; stir into boiling water. Cook until thickened, stirring often. Cover; continue cooking over low heat, 10 minutes for yellow cornmeal, 5 minutes for white cornmeal.
Line greased 9" X 9" X 2" baking dish with two thirds of mush. Add hot filling; sprinkle with cheese. Top with remaining mush.