Using an electric mixer, combine mashed potato, milk, vanilla, and salt in a spacious bowl.
Slowly incorporate powdered sugar, adding one cup at a time. Keep blending until you get a robust dough. If it’s too sticky, sprinkle in additional sugar, tablespoon by tablespoon.
Transform the dough into a ball and roll it out into a thin 10×12-inch rectangle, about 1/8-inch thick. Dust it lightly with powdered sugar.
Smear an even layer of peanut butter on top. With the help of parchment paper, roll the dough up tightly and place it in the freezer for an hour.
Once firm, cut the roll into 1/4-inch segments.
To store, place the candies in an airtight container and refrigerate.
And there you have it – the timeless Old-Fashioned Potato Candy. It’s more than just a recipe; it’s a bridge to the past, a reminder of loved ones and the memories shared. So, the next time you’re yearning for a unique and heartwarming treat, whip up a batch of this potato candy and let nostalgia do its magic.