Peanut Butter Pinwheel Candy

I have been looking for this dessert for over 40 years.  I used to eat one almost every day at the BYU-Hawaii Cafeteria.  I found it!!!  

 4 Tlb  of  a peeled russet potato, cooked and pushed through a mesh strainer

Powdered sugar

Mix mashed potato adding powdered sugar until it is firm enoough to roll out on parchment paper into a rectangle.  The mashed potato turns the powdered sugar into amost a liquid. Keep adding powdered sugar.

Spread with peanut butter.

Roll up like a pinwheel/cinnamon roll.  Cut thin slices with a serrated knife. Refrigerate.