1. Add 80g of fine corn flour, 200g of white flour, 3g of aluminum-free baking powder, 3g of yeast, 20g of white sugar and140g of warm water into a bowl, melt the yeast and beat an egg.

2. Add flour, mix the dough, stir fry in a sealed way, knead the dough and exhaust, roll it into a round cake and put it on a steamer, and stir fry in a warm water pot until it is twice as big. After cooking, cover the pot and steam for 20 minutes, and turn off the fire for 5 minutes.