INGREDIENTS
1 lb lean ground beef
1/2 teaspoon garlic powder
2 tablespoons butter
1 small yellow onion, diced
1 green bell pepper, seeded and diced
2 tablespoons ketchup
1 tablespoon Worcestershire sauce
1 tablespoon cornstarch
1 cup beef broth
8 oz provolone cheese slices
6 hamburger buns
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