Swiss Mushroom Melt Delight

**Ingredients:**

– 1 tbsp Worcestershire sauce
– 1 lb ground beef (80/20 blend)
– 4 slices Swiss cheese
– 1 tbsp butter
– 4 slices sourdough or rye bread
– 1 cup mushrooms (sliced)
– 1 tbsp oil for grilling
– 2 tbsp mayo or garlic aioli
– 1 tsp salt & black pepper

**Instructions:**

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