Preparation 
1. Sauté Vegetables: In a large skillet, heat the olive oil over medium heat. Add the ground beef, onion, and bell pepper. Cook, breaking up the beef, until browned and the vegetables are softened. Add the minced garlic and cook for another minute. 
2. Add Liquid Ingredients: Pour in the beef broth, Worcestershire sauce, dried oregano, salt, and black pepper. Stir to combine and let the mixture simmer for 5-10 minutes, until most of the liquid has evaporated. 
3. Add Cheese: Stir in the shredded provolone or Swiss cheese until melted and well incorporated. 
4. Assemble Sandwiches: Spoon the cheesy beef mixture onto the toasted hamburger buns. Serve warm and enjoy! 
