Confectioner's sugar
Peanut butter
Mash the potato in a 1 quart bowl. Add confectioner's sugar until mixture is of the consistency of pie dough. Roll dough out on waxed paper to the thickness of pie dough. Shape into a rectangle.
Spread with thin layer of peanut butter. Roll up from one long side and then cut slices 1/4" thick. They're ready to eat