Begin by drizzling a generous tablespoon of olive oil into a large skillet over medium-high heat. Allow the oil to heat for about 1 minute until it shimmers.

Add sliced onions and bell peppers to the hot skillet and sauté for 3-5 minutes until they soften and begin to caramelize slightly.

Push the sautéed vegetables to one side of the skillet and add the ground beef, breaking it apart with a spatula. Cook undisturbed for 5-7 minutes until browned.

Once the beef is browned, sprinkle in garlic powder, Worcestershire sauce, salt, and black pepper, stirring for about 2 minutes.

Reduce the heat to low, distribute slices of provolone cheese over the beef mixture, cover, and let it sit for 2-3 minutes to melt.

Slice hoagie rolls lengthwise without cutting all the way through to create a pocket.

Spoon the cheesy beef and vegetable mixture into each hoagie roll, packing it generously.

For added crunch, toast the filled hoagie rolls in a toaster oven or under a broiler for 2-3 minutes before serving.