Generally speaking, there is no need to add yeast to the flour for making steamed bread. The flour made of steamed bread skin is usually made of high-gluten flour, added with appropriate amount of water, kneaded and stretched. The steamed bread skin needs to be wrapped with water vapor as much as possible in the cooking process, and the moisture in the flour can be properly controlled in the making process to obtain better texture and taste.

However, if you want to make fluffy and delicious steamed bread skin, you can also ferment it with yeast. At this time, it is necessary to add a proper amount of yeast to the flour, and add ingredients such as sugar, salt and water in a certain proportion to make dough. After the dough is made, it needs to be left standing for 1-2 hours, or fermented in a warm place to double its size, so as to make fluffy steamed bread skin.

To sum up, you can choose whether to add yeast to the flour of steamed stuffed bun skin according to your own preferences. If you want a simpler and cheaper method, you can choose not to add yeast; If you want to make more fluffy and delicious skins, you can consider adding yeast.