This recipe is from Shirley McNevich's Mom's Best Recipes Vol 5. Published here with her permission.
Don't forget to check Shirley's blog.
(by Shirley McNevich)
1 small red potato
Domino's powdered sugar
Jif peanut butter
Wash and peel potato--cut potato into chunks and put it in a small saucepan.
Cover the potato with water and add a dash of salt--set heat on medium and
bring to a boil, then cook until tender. Drain potato pieces, then place cooked
pieces in a bowl and mash them (very fine). Add enough powdered sugar
and keep working it until it forms a dough-like consistency. Sprinkle a little
powdered sugar on your counter, place dough ball on top and sprinkle the
top with powdered sugar. Use a rolling pin to roll the dough to 1/4" thick.
Spread a layer of peanut butter on the top side of the dough. Start at one end
and roll the dough tightly (like a jelly roll). Wrap the dough log in Saran wrap--
refrigerate a few hours until stiff. Unwrap the dough log and use a sharp knife
to cut the log into coin shaped pieces.