01 - Set oven to 375°F for toasting the rolls and melting the cheese.
02 - Heat olive oil in a large skillet over medium heat. Add onions and bell peppers, cooking until softened and lightly caramelized, approximately 7–8 minutes. Stir in minced garlic and cook for 1 additional minute.
03 - Push vegetables to the side of the skillet. Add ground beef and break apart while cooking until browned completely, about 6–8 minutes. Drain excess grease if necessary.
04 - Combine beef with vegetables. Add Worcestershire sauce, salt, and black pepper. Stir thoroughly and continue cooking for 2 minutes to meld flavors.
05 - Cut hoagie rolls in half lengthwise. Spread softened butter on cut sides. Place on baking sheet and toast in oven until lightly crisp, 3–5 minutes.
06 - Fill each roll with equal portions of hot beef mixture. Place a slice of provolone on top. Return to oven for 2–3 minutes until cheese is fully melted and bubbly.
07 - Remove from oven and serve hot. Optionally garnish with pickled peppers or additional condiments as desired.