Cook the beef: Add the remaining olive oil to the skillet. Cook the shaved beef in batches, seasoning with salt and pepper. Use tongs or a spatula to break apart the beef and cook until browned.
Combine ingredients: Return the onions and peppers to the skillet and mix with the beef.
Assemble the sandwich: Open the hoagie rolls and fill them with the beef and vegetable mixture. Top with cheese.
Melt the cheese: Place the assembled sandwiches under a broiler for 1-2 minutes or until the cheese melts. Serve hot and enjoy this classic comfort food.
Notes
For added flavor, toast the hoagie rolls lightly before assembling the sandwiches.