INGREDIENTS
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2 tablespoons butter
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1 small yellow onion, diced
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1 small green bell pepper, diced
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8 ounces brown mushrooms minced
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1/2 teaspoon Kosher salt
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1/2 teaspoon fresh ground black pepper
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2 pounds lean ground beef (80/20 or 85/15)
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2 tablespoons ketchup
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2 tablespoons Worcestershire sauce
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2 eggs
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1 cup panko breadcrumbs
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8 ounces Provolone Cheese Slices
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