Bake Garlic Bread according to directions on box. Meanwhile,saute mushrooms,onions and garlic in butter until tender. Stir in Worcestershire sauce.
Layer each half of garlic bread with roast beef and mushroom mixture and top with cheeses.Return to oven;bake 1-2 minutes until cheese is melted. Slice and serve immediately.Goes good with fries/chips and Cole slaw/ potato salad whatever you like.