1. Preheat over to 375°F In large bowl combine ground beef, onion, cracker crumbs, egg, milk, chili powder and salt: mix well. Gently press mixture into bottom of 9-inch square baking pan. Bake 20-25 minutes or until no longer pink in center and juices run clear. Carefully pour off juices.
2. Meanwhile, in medium bowl, combine mashed potatoes, corn with peppers and onions. Spread over meatloaf to edges of pan; sprinkle with cheese. Broil 3 to 4 inches from heat 3 to 5 minutes or until top is lightly browned.