Enchilada Casserole
["2 lb. ground chuck", "1 medium onion, chopped", "2 (8 oz.) cans tomato sauce", "1 (11 oz.) can Mexicorn, drained", "1 (10 oz.) can enchilada sauce", "1 tsp. chili powder", "1/2 tsp. dried oregano", "1/2 tsp. pepper", "1/4 tsp. salt", "1 (6 1/2 oz.) pkg. corn tortillas, divided", "2 c. (8 oz.) shredded Cheddar cheese"]
["Cook beef and onion in a large skillet until beef is browned, stirring until it crumbles. Drain."]
["ground chuck", "onion", "tomato sauce", "Mexicorn", "enchilada sauce", "chili powder", "oregano", "pepper", "salt", "corn tortillas", "Cheddar cheese"]