In a large skillet, place hamburger, garlic, salt and pepper on medium heat; brown the hamburger (drain all but 2 tablespoon of fat before proceeding).
Add peppers, onions, mushrooms and Worcestershire sauce; stir as vegetables soften.
Reduce heat to low and place cheese slices in a circle atop the meat/vegetable mixture.
Slice open the buns, if not sliced, and butter each interior side.
If able, lightly toast the buttered sides of the buns under a broiler or in a pizza/toaster oven.
Using a spoon or tongs, fill each roll.