1Heat oven to 350°. Sprinkle beef with salt and pepper. Cook beef and onion in 10-inch skillet over medium heat 8 to 10 minutes, stirring occasionally, until beef is brown; drain. Stir in sour cream and corn.
2Sprinkle 1 cup of the cheese in bottom of ungreased rectangular baking dish, 13x9x2 inches. Spoon about 1/2 cup beef mixture onto each tortilla; top with a few drops hot enchilada sauce. Roll tortilla around filling; place seam side down on cheese in baking dish. Pour remaining hot and mild sauces over enchiladas. Sprinkle with remaining 1 cup cheese.
3Bake uncovered about 15 minutes or until cheese is bubbly.