- 1/4 cup mashed potatoes
- 2 tablespoons milk
- 1 teaspoon vanilla extract
- 1 pinch salt
- 1 (16 ounce) package confectioners' sugar
- 1 tablespoon confectioners' sugar for dusting, or as needed
- 1/3 cup peanut butter, or as needed
- Combine mashed potatoes, milk, vanilla extract, and salt in a bowl.
- Stir confectioners' sugar into potato mixture until a dough consistency is reached. Refrigerate dough until chilled, about 1 hour.
- Sprinkle confectioners' sugar on a cutting board or waxed paper.
- Roll dough into a large rectangular shape on prepared surface.
- Spread enough peanut butter on top layer of dough to cover.
- Roll dough into a jelly roll shape; refrigerate roll for 1 hour. Slice dough into pinwheels to serve.