Ingredients:
1 lb ground beef
1 tablespoon olive oil
1 medium onion, chopped
1 green bell pepper, chopped
2 cloves garlic, minced
1/2 teaspoon salt
1/2 teaspoon black pepper
1 tablespoon Worcestershire sauce
1 cup beef broth
2 tablespoons ketchup
1 tablespoon cornstarch
4 slices provolone cheese
4 hamburger buns
Step-by-Step Instructions:
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