You can't. Ready-mixed powder (some are also called ready-mixed powder) refers to baking raw materials that are pre-mixed and then sold to manufacturers according to the formula. Cooked cake powder is a kind of processing powder (also known as Chaozhou powder), mainly glutinous rice flour which is fried and ground into fine powder. Powder particles are loose, generally clean and white, with high water absorption, and stick together when meeting water. The products are soft and slippery, and are mostly used in Cantonese dim sum, moon cakes and water cake skins. Their functions are different. Ready-mixed powder is the raw material of West Point, and cooked cake powder is the raw material of the middle point, so cooked cake powder cannot be used as ready-mixed powder.