A thin puff dough biscuit for a refrigerated or frozen food product. The biscuit has a laminar structure containing 6 to 10 sheets of puff dough and a maximum thickness of at most 2 mm. The biscuit is baked between two heated surfaces so as to prevent the development of the puff dough, and it is coated with a composition, in particular a fatty composition, which serves as a moisture barrier. This biscuit serves as an inclusion or an annex in a composite frozen cake that has at least one layer of the preceding biscuit included in a mass of cream and in which the layers of biscuit are separated from each other by layers of cream.