01 -
Combine mashed potatoes, butter, and one cup of powdered sugar in a large bowl and use an electric mixer to stir until combined.
02 -
Add the remaining powdered sugar, one cup at a time, stirring until combined after each addition. Check consistency after 6 cups; add more if needed until the dough is firm and moldable.
03 -
Stir in the vanilla extract until fully incorporated.
04 -
Refrigerate the dough for at least 30-60 minutes. If too firm after chilling, let it sit at room temperature for 10-15 minutes until pliable.
05 -
Divide the dough into two pieces. Generously dust a clean surface with powdered sugar and roll one piece into a rectangle about 6 mm (¼ inch) thick (approximately 20 x 30 cm). Add extra powdered sugar if needed to keep it from sticking.
06 -
Evenly spread creamy peanut butter over the rolled dough, leaving a small border around the edges.
07 -
Starting from the longer side, tightly roll the dough into a log. Use a sharp knife to slice into pieces about 6-12 mm (¼-½ inch) thick.
08 -
Repeat the rolling, spreading, and slicing steps with the remaining dough. Store leftover candy in an airtight container in the refrigerator for up to one week.