Heat oven to 450°F. Coat 12 x 8 x 2-inch baking dish with nonstick cooking spray.
Sauté beef in skillet over medium heat, breaking up clumps with wooden spoon, 3 to 4 minutes or until no longer pink.
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°F oven 20 minutes. Sprinkle on cheese. Bake 5 minutes, until knife inserted in center tests clean. Let stand 10 minutes.