Drizzle olive oil into a large skillet over medium-high heat. Allow the oil to warm until it shimmers.

Add sliced onions and green bell peppers to the skillet. Sauté for 3-5 minutes until the onions turn translucent.

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

Sprinkle in garlic powder, Worcestershire sauce, salt, and pepper; stir for about 2 minutes.

Reduce heat to low, place provolone cheese on top, cover, and allow to melt for 2-3 minutes.

Slice hoagie rolls lengthwise without cutting all the way through.

Scoop the beef and vegetable mixture into each hoagie roll.

Serve hot, optionally toasting the sandwiches in the skillet for a crispy finish.