简单零失败的广式鸡蛋松糕教程，口感特别松软香甜，入口绵软湿润不发干，真的超好吃！Egg Steamed Chinese sponge cake。

主要食材：温水20克，耐高糖酵母粉3克，鸡蛋4个，牛奶150克，白糖80克，吉士粉10克，面粉200克，木薯淀粉50克，黄油20克，无铝泡打粉3克。
Main ingredients: 20 grams of warm water, 3 grams of high sugar resistant yeast powder, 4 eggs, 150 grams of milk, 80 grams of white sugar, 10 grams of custard powder, 200 grams of flour, 50 grams of cassava starch, 20 grams of butter, and 3 grams of aluminum free baking powder.