1Heat coals or gas grill for direct heat.
2Sprinkle 1 side of each frozen ground beef patty with garlic pepper.
3Cover and grill patties, pepper side up, 4 to 5 inches from medium heat about 10 minutes for medium doneness, turning once. During last minute of grilling, spoon 1 tablespoon cheese sauce onto each patty; spread slightly. Cover and grill until cheese sauce begins to melt.
4Sprinkle with onions. Serve on buns.