My mom made this when I was little. It is terrific.
1 medium size potato
1 box powdered sugar
1 small jar peanut butter
Boil potato until well done; take peeling off and mash well. Mix powdered sugar with potato until it is thick enough to roll out (takes about 1 box). Sprinkle dough board with powdered sugar; roll out and spread with peanut butter. Roll up, wrap in wax paper and refrigerate until cool enough to slice.