Barquillos (Wafer Rolls)

Preheat the oven to 375 degrees F (190 degrees C). Lightly grease two baking sheets.

Beat butter, sugar, and vanilla with an electric mixer in a large bowl until smooth. Add egg whites, one at a time, allowing each to blend into butter mixture before adding the next. Mix in flour until just incorporated.

Drop teaspoonfuls of dough onto ungreased baking sheets. Spread thinly with a spatula or the back of the spoon into 3-inch circles.

Bake in the preheated oven until browned along the edges, about 5 minutes.

Remove baked wafers from the baking sheet one at a time using a spatula or kitchen turner. Roll each wafer around the handle of a wooden spoon until the edges overlap. Cool seam-side down on a wire rack until completely crisp.