"Mille-feuille" is French for "a thousand leaves." These stacked pastries are also known as Napoleons. Mille-feuilles are made of many layers of puff pastry alternating with pastry or whipped cream. The top is glazed with icing, traditionally in combed white and brown chocolate. When making mille-feuilles, chefs generally use long pieces of pastry and then cut them into individual serving sizes with a serrated knife. You can also find savory mille-feuilles, filled with things like cheese or spinach instead of cream. We'll stick with the sweet ones, though!