Philly Cheesesteak Flatbread Ahhh.............the Philly Cheesesteak.......it's iconic. I know there are many versions out there. I recently saw a picture of a Philly Cheesesteak Sandwich and it looked sooooo yummy. But it's a lot of bread, so why not reduced the amount of bread? Make it flat.......oh yeah.....flatbread.......Philly Cheesesteak Flatbread! This could not be easier.