Heat olive oil in a large skillet over medium-high heat.
Add the sliced onion and bell pepper, and sauté for about 5-7 minutes until they are soft and slightly caramelized. Season with garlic powder, salt, and pepper.
Add the thinly sliced ribeye steak to the skillet. Cook for about 5-7 minutes, stirring frequently, until the steak is browned and cooked through.
While the steak is cooking, preheat your oven to 350°F.
Once the steak is done, divide the mixture into four portions in the skillet. Place two slices of provolone cheese on top of each portion and cover the skillet with a lid for 1-2 minutes until the cheese melts.
Slice the hoagie rolls lengthwise, but not all the way through. Place each cheesy steak portion into a roll and transfer to a baking sheet.
Bake in the preheated oven for about 5 minutes to toast the rolls and melt the cheese further.
Serve immediately while hot and enjoy your classic Philly cheesesteak!