Mousse cake is actually also made from cream and cake blanks, except that gelatin sheets are added to make the whipped cream in a solidified state. So the calorie content of the same volume of mousse cake and buttercream is more or less the same.

Mousse cake is a kind of pastry with mousse powder as the main material. The appearance, color, structure and taste are richly varied and more natural and pure, usually with the addition of cream and coagulant to create a thick jelly-like effect.

The English word for mousse is mousse, which is a kind of custard-style dessert that can be eaten directly or made into a cake sandwich, usually by adding cream and coagulant to create a thick jelly-like effect.