Preheat your oven to 250 degrees.
In a skillet over medium/high heat, saute the onions, bell peppers, & mushrooms in the butter. Set aside. Wipe out the pan, and return to high heat Add the ribeye steak & season with either salt & pepper or steak seasoning. Cook for a couple of minutes. Set aside
On each side of the skillet (on low/medium heat), layer the cooked ribeye, onions, bell pepper, & onions Cover with 3-4 pieces of provolone cheese. Allow to sit about 2 minute for the cheese to melt. Transfer to a hoagie roll. Roll very tightly in a square of tinfoil. Bake for 15 minutes.