These brown butter sugar cookies have a delightful caramel flavor from the brown butter. They are rich, buttery and fill your entire kitchen with a warm, nutty aroma as they bake in the oven.
STEP 2: Keep stirring until the butter begins to turn a light amber color. The foam will subside and you will have little brown specks (milk solids) at the bottom of the pan.
STEP 3: Scrape the cooled brown butter into a large bowl. Then, mix in the sugar with a rubber spatula. Next, add the whole egg, egg yolk and vanilla extract. Mix until combined.