Peel and boil potato until almost ready to dissolve. Drain. Using a fork, mash the potato in a bowl, adding powdered sugar until mixture has a dough like texture. Roll the candy dough flat to 1/4-inch thickness. Sprinkle with powdered sugar. Spread liberally with peanut butter. Roll candy dough into a "log". Slice candy log into desired thickness (1/4-inch suggested) to create candy pinwheels. Chill and keep refrigerated. Yum-yum!