Heat a drizzle of olive oil in a large skillet over medium-high heat.

Add the sliced onions and bell peppers. Sauté for 3-5 minutes until they become tender. If adding mushrooms, toss them in now and continue cooking for another 3 minutes.

Push the veggies to one side of the skillet and add the ground beef, breaking it apart with a spatula. Cook for about 5-7 minutes until the beef is no longer pink.

Stir in the garlic powder, Worcestershire sauce, salt, and pepper. Mix everything well and cook for an additional 2 minutes.

Lower the heat and layer the provolone cheese over the beef mixture. Cover the skillet to let the cheese melt for 2-3 minutes.

Slice the hoagie rolls lengthwise. Spoon the beef and vegetable mixture into each roll, serve hot, and consider toasting the rolls for an extra crispy texture.