1: Sauté thinly sliced sirloin, onions, and peppers in a pan until the meat is cooked and veggies are tender.
2: In another saucepan, melt the butter and whisk in the flour to form a roux.
3: Gradually add milk while continuously whisking to avoid lumps.
4: Stir in provolone cheese until melted and smooth. Season with salt and pepper.
5: Serve the sirloin and veggies on a hoagie roll and drizzle with cheese sauce.
