First, put corn flour and flour into a pot, add yeast powder and baking powder and mix well; Add warm water to make dough, beat it evenly with plastic wrap and put it in a warm place to wake it up; The dough can be taken out, kneaded into dough, and cut into strips after about one hour. Knead the dough into a circle and cut it into two small doses with a knife; Press the larger dough into cakes; Rub the small dose into a circle, apply oil to 3/4 of the small dose with an oil brush, and put it on the large dose pressed into cakes; Drag the dough with one hand, hold down the small dose with the other hand, and rotate the dough while holding down, so that the dough wraps around 3/4 of the greased part in the small dose, and a grain embryo wrapping is completed; What needs to be done next is to steam the prepared cereal-wrapped embryo on the steamer for 15 minutes, then steam it in the steamer for 15 minutes, and then take it out. You can take out a small dose of dough with a gentle press of your hand, and the rest is the finished cereal bag!