Instructions

1. Preheat oven to 350°F. Cook beef and onion in a large skillet over medium heat until beef is browned and crumbly; drain and return to skillet. Stir in garlic powder, ketchup, 2 tsp mustard, and 2 tsp Worcestershire sauce. Season with salt and pepper to taste.
2. Cut rolls in half horizontally without separating rolls. Place bottom halves in a lightly greased 11- x 7-inch baking dish. Spread meat mixture on rolls, and arrange cheese slices over meat mixture. Cover with roll tops.
3. Combine butter, brown sugar, 1 tsp mustard, and 1 tsp Worcestershire sauce in a microwavable bowl; cover loosely, and microwave at HIGH until butter is melted. Pour mixture over rolls.
4. Cover and bake 15 minutes. Uncover and bake 10 minutes longer or until cheese is melted and rolls are golden brown.