It is a very easy steamed buns prepared from wheat flour,also known as mantou or Bao buns. Everything you need to know about Bao Buns. Bao Buns, but also known as a 'steamed buns' or 'baozi', are a delicious, warm, fluffy treat of stuffing wrapped inside a sweet, white dough. They are usually made of white wheat flour, but other ingredients, such as corn flour, sweet potato, pumpkin, are sometimes added to the dough. As a popular staple, Mantou has a firm position on Chinese families' dinner table.