Dulce de Leche Walnut Cookies

First, separate the egg whites from the yolks. Mix the sugar with the yolks. In a separate bowl, combine the flour, baking powder, and vanilla sugar, add the softened butter, and mix to form the base. Whip the egg whites until foamy. Mix the yolks into the dough, then gently fold in the egg whites—the dough will be slightly sticky, but this is normal.

Preheat your walnut cookie maker and lightly grease the molds with oil. Roll the dough into small balls, place them in the appliance, cover, and bake for 4 minutes. Carefully remove them and trim the edges.