千层饼又称拿破仑饼、香草薄饼、巧克力薄饼、奶油薄饼或者蛋奶薄饼，它是一种多层酥饼，饼间夹有甜的陷料。经典的味道是奶黄味，有时也有泡打奶油和果酱味。在它的上面通常裹有棕色与白色相间的梳状条纹，这是由糖衣或者方旦糖制作成的。

还有一些美味的千层饼是由奶酪和菠菜制成的。

The mille-feuille (French pronunciation: ​[mil fœj], "a thousand leaves"), vanilla slice, custard slice, also known as the Napoleon, is a French pastry whose exact origin is unknown. Its modern form was influenced by improvements of Marie-Antoine Carême.