Peach Crème Mousseline Cake

In this elegant cake, slices of one cake are used to make the sides for another. You’ll need a cake ring or springform pan to hold the cake slices and filling in place. This recipe uses only two cake layers and enough peach crème mousseline to fill up the cake ring, but you can use as many cake layers as you like and stack them with other fillings, such as Bavarian cream or white chocolate mousse. It is most convenient to make two sheet cakes and use one to make the squares for lining the c