(If baking right away, preheat oven to 350 degrees F, or wait till dough is chilled to preheat.) Line baking sheets with parchment paper, or use baking stones. In skillet over medium heat, melt one stick of butter. Stir occasionally, until frothy and brown bits appear and butter smells nutty, about 7-10 minutes. Remove from heat and pour in bowl to slightly cool.