Are you talking about the kind of sugar on the dessert? It's frosty and covered with snow. That's called powdered sugar.

powdered sugar is generally a mixture of corn starch and ground sugar, and its taste is the same as that of sucrose. Therefore, when it is used, it is generally used as the surface decoration of western-style cakes to make the cakes look better. Sometimes in western-style pastry making, there will be soft sugar instead of powdered sugar, but there are still differences in taste. Especially when making cookies, you can clearly feel the importance of powdered sugar. Because powdered sugar can explain the extensibility of biscuit dough and make the pattern of biscuit clearer.