Heat oven to 450�. Coat 12x8x2-inch baking dish with nonstick cooking spray.
Saute beef in skillet over medium heat, breaking up clumps with wooden spoon, 3-4 minutes or until no pink remains.
Reserve 1 cup cheese for topping. Mix together remaining cheese, corn muffin mix, eggs, salsa, chili powder, corn, beef and 2 cups water until smooth. Scrape into prepared dish.
Bake in 450� oven for 20 minutes. Sprinkle on cheese. Bake 5 minutes, until knife inserted in center test clean. Let stand 10 minutes.