I have searched the internet high and low and found nothing even close to the flatbread that Cosi serves and makes their sandwiches with.
For those that don't know Cosi, it is a chain of coffee/sandwich places. The bread is baked and then sliced in half to make the sandwich. It is textured on top. It is fantastic as it has a soft light interior and nice texture on the top.
One thing I do know is that they let the dough sit uncovered which helps create the texture on the top. I think they must also put something on top.
Most flatbread recipes I have seen are too thin to be sliced in half.
I guess if I was really bored/desperate I could stand there all day and watch what they do as they make it from scratch at each location right in view.