There is no need to add baking powder, because yeast has the function of puffing dough. The method is as follows: \x0d\ 1. Materials \x0d\ 450g flour, 5g yeast, 50g sugar and 225g water \x0d\ 2. Method \x0d\ 1. Mix flour and sugar. \x0d\2。 Dissolve about 5g of dry yeast in warm water at 30 degrees, and let it stand for 5min \x0d\3. Add yeast water to the flour bit by bit and knead the flour until the surface is smooth. \x0d\4。 Add about 40 degrees of water into the steamer, put the dough into the container, then put it into the steamer, cover it with plastic wrap (to prevent steam from dripping), and then cover the steamer. Hair loss \x0d\5. About an hour. The dough becomes twice as big. Take out the dough, exhaust it, knead it to make the dough surface smooth, and then wake it up at room temperature for half an hour. \x0d\6。 Sprinkle some flour on the chopping board, divide the dough into 6 parts and knead it into 6 balls. \x0d\7。 Put the drawer cloth in the steamer, and put the dough in the steamer and let it stand for about 10 minute. Boil over medium heat, then steam 18 minutes.