Mash together potato, maragine, salt, vanilla
Mix in confectioner sugar until you have a stiff dough
Sprinkle confectioner sugar over waxe paper
Roll dough thin into a rectangular, keep sugar on rolling pin
Spread with 1/4" peanut butter
Roll by wax paper like a jelly roll
Put in refrigerator for a couple of hours until chilled
Slice and serve