01 - Preheat oven to 375°F.
02 - In a large skillet over medium heat, add olive oil. Sauté onions and peppers until softened and lightly caramelized, about 7–8 minutes. Add garlic and cook for 1 more minute.
03 - Push vegetables to the side of the pan and add ground beef. Cook, breaking up the meat, until browned and cooked through, about 6–8 minutes. Drain excess fat if needed.
04 - Stir together the beef and vegetables. Add Worcestershire sauce, salt, and black pepper. Cook for 2 more minutes.
05 - Slice hoagie rolls and spread butter on the insides. Toast in the oven for 3–5 minutes until lightly crisp.
06 - Scoop the hot beef mixture evenly into the rolls. Top each with a slice of provolone. Return to the oven for 2–3 minutes, or until cheese is melted.
07 - Serve immediately, optionally with pickled peppers or extra condiments.