1 med. potato
Dash of salt
1 tsp. vanilla (optional)
1 lb. box confectioner' sugar (more may be needed)
Peanut butter

Boil potato in its skin until done. Peel potato and mash until smooth, adding only salt and vanilla while mashing. Add confectioner's sugar until mixture is stiff enough to roll. On a surface sprinkled with confectioner's sugar, roll mixture until it's about 1/4 inch thick. You may have to divide the mixture in half to do this. Spread the surface with a thin layer of peanut butter. Roll up like a long jelly roll and chill for a few hours in refrigerator. Cut into slices.