Preheat the oven to 300°F. Line 2 baking sheets with parchment paper (do not use silicone liners).

Combine in a medium heavy saucepan:

Stir over low heat until the butter is melted and the mixture is smooth. Remove from the heat and stir in:

Let cool until firm enough to shape. Roll into ¾-inch balls and arrange about 2 inches apart on the prepared baking sheets. Bake 1 sheet at a time until browned on the edges, 12 to 15 minutes, rotating the sheet halfway through. Let cool on the sheet for 2 or 3 minutes, then roll up each still-warm cookie on the handle of a wooden spoon. If some of the wafers cool too much to shape, return the sheet to the oven briefly to warm and soften them.