Add some whole wheat flour to the flour, add some warm water, add yeast powder and baking powder and mix well. Then add the yeast liquid into the flour and stir until there is no dry powder, and knead it into dough by hand to make it twice as big. Then take out the dough, knead it into long strips, divide it into equal doses, knead it into steamed bread shape, and steam it in a pot for about 20 minutes.