Heat a large skillet over medium-high heat and add olive oil.

Add sliced onion and green bell pepper; sauté for 3-5 minutes until softened.

If using mushrooms, add them after 3 minutes and cook for an additional 3 minutes.

Push vegetables to the side and add ground beef; cook for 5-7 minutes until browned.

Stir in garlic powder, Worcestershire sauce, salt, and pepper; cook for another 2 minutes.

Lower heat and lay provolone cheese over the mixture; cover until cheese melts (2-3 minutes).

Slice hoagie rolls lengthwise; prepare for filling.

Spoon beef and vegetable mixture into hoagie rolls, ensuring cheese is included.

Serve hot, optionally toasting the rolls for extra crunch.