Begin by softening the unsalted butter in a mixing bowl. Add in the powdered sugar, vanilla extract, and a pinch of salt, then mix thoroughly until smooth and creamy.

Gently fold in the raisins until evenly distributed throughout the filling.

Take a wafer sheet and spread a generous layer of the prepared filling over its entire surface. Carefully roll the sheet tightly from one end to the other.

Place the rolled wafer treats in the refrigerator for about 30 minutes to allow the filling to set.

After chilling, slice the rolls into bite-sized pieces using a sharp knife.

Store leftovers in an airtight container in a cool place for up to a week.