Much of the appeal of these see-through wafers is in their brittle, caramelized texture, so be sure to make them on a dry day.
Preheat the oven to 375°F. Line 2 baking sheets or cookie sheets with parchment paper or silicone liners.
Melt in a medium saucepan:
Simmer the butter gently, stirring occasionally, until the solids on the bottom of the pan turn light brown, 3 to 4 minutes. Remove from the heat and stir in until blended:
Stir in until combined:
Drop the batter by the teaspoon about 3 ½ inches apart onto the baking sheets. Bake 1 sheet at a time until the cookies are lightly browned, 12 to 14 minutes, rotating the sheet halfway through. Let cool on the sheet for 2 to 3 minutes, then transfer to a wire rack to cool completely.