I learned to make this in school 40 years ago but lost the recipe. I always start with cold left over mashed potatoes. Then add your sugar. Work it util a stiff dough is formed then layer your surface with 10x sugar and roll out. To make spreading easier you can slightly warn your peanut butter by floating the jar in a bowl of warm water Not Hot. If its too warm it will squeeze out when you roll it. Speard out the PB and let it rest a 10 minutes or until the PB comes back to room temp before rolling. Chill the roll for 1 hr before slicing.