01 - Preheat oven to 375°F.
02 - Heat olive oil in a large skillet over medium heat. Add onions and peppers, sauté until softened and lightly caramelized, about 7–8 minutes. Add garlic and cook for 1 additional minute.
03 - Push vegetables to the side of the pan. Add ground beef and cook, breaking up with a spatula, until browned and cooked through, approximately 6–8 minutes. Drain excess fat if necessary.
04 - Mix beef with vegetables. Stir in Worcestershire sauce, salt, and black pepper. Cook for 2 minutes to meld flavors.
05 - Slice hoagie rolls open. Spread softened butter on cut sides. Place on baking tray and toast in oven for 3–5 minutes until lightly crisp.
06 - Evenly distribute hot beef mixture into toasted rolls. Top each sandwich with a slice of provolone cheese. Return to oven for 2–3 minutes until cheese is fully melted and bubbly.
07 - Serve immediately while hot. Optional garnishes include pickled peppers or additional condiments.