Steps

• Wash and chop all the vegetables. Dice the green bell pepper and yellow onion into small pieces. Heat your olive oil in a large skillet over medium heat.
• Add the diced bell pepper and onion to the heated oil. Sauté until soft and translucent, about 5 minutes, stirring occasionally.
• Push the vegetables to one side of the skillet. Add the ground beef and break it up into small pieces as it cooks, mixing with the vegetables.
• Pour in the beef broth and Worcestershire sauce. Let the mixture simmer for 5 to 7 minutes until the liquid reduces. Season with salt and pepper as desired.
• Reduce heat to low and gradually sprinkle shredded provolone cheese over the mixture, stirring gently until melted.
• Spoon the beef-cheese mixture onto the bottom halves of the hamburger buns and cover with the top halves. Serve immediately.