Bake garlic bread according to package directions. Meanwhile, in a large skillet, saute mushrooms and onion in butter until vegetables are tender. Add minced garlic, cook 1 minute longer. Stir in Worcestershire sauce.
Layer each half of garlic bread with roast beef, mushroom-mixture and cheese. Return to oven; bake a few minutes longer until cheese is melted. Slice and serve immediately.
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