Heat the olive oil in a large skillet over medium heat. Add the onion and bell pepper and cook until softened, about 5 minutes. Add the beef and season with salt, pepper, and garlic powder. Cook until the beef is browned, about 10 minutes. Add the Worcestershire sauce and cook for another 5 minutes.
Preheat the oven to 350 degrees F (175 degrees C). Line a baking sheet with aluminum foil.
Split the hoagie rolls and place them on the prepared baking sheet. Top each roll with a slice of cheese, then a portion of the beef mixture. Top with another slice of cheese.
Bake in the preheated oven until the cheese is melted and bubbly, about 10 minutes.
Serve the sandwiches on the hoagie rolls.
Interesting Facts
The Philly cheesesteak sandwich was invented in the 1930s in Philadelphia, Pennsylvania.
This sandwich is traditionally served on an Italian roll.
The sandwich is often served with fried onions, bell peppers, mushrooms, and cheese.