Warm oil in a large skillet over medium-high heat, add sliced onions and peppers, sauté until soft. Remove from skillet and set aside.
In the heated skillet, add the thinly sliced Ribeye steak, salt and pepper to taste. Cook steak for about 45 – 60 seconds, then top with BelGioioso Provolone and let the cheese melt.
While cheese is melting, in another heated skillet, warm the Piadina on both sides. Add the cheesesteak, onions and peppers to one half of the Piadina, fold and quickly heat again on both sides. Serves 4 for lunch or 8 as an appetizer.