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Detailed Recipe & Step By Step Instruction Here 
Ingredients:
1 lb lean ground beef
1 yellow onion, finely diced
1 green pepper, chopped
1 cup mushrooms, sliced
1 tbsp Worcestershire sauce
1/2 tsp garlic powder 1/2 tsp onion powder
4 slices provolone cheese
4 hamburger buns
2 tbsp butter
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