why crisco for fondant when rolling?
It helps keep it from gluing to the counter. Powdered sugar tends to leave a powdery surface. Often it doesn't matter, but it can be obvious on some colors.
If you roll it out on a plastic or slicone sheet, you won't need powdered sugar and you can use the plastic to transfer the fondant.
Rolling out fondant on powdered sugar will also dry out the fondant. The shortening helps to prevent sticking and keeps it pliable. It doesn't take much shortening and it really does the trick.