1. Dissolve the yeast with half the warm water in the recipe (if the recipe uses 120g water, dissolve the yeast with 60g water).

2. Weigh dry materials such as flour, sugar, salt and milk powder and mix them evenly. Then add ingredients other than butter, such as water that dissolves yeast, the other half of water, and broken eggs.

3. Rub the dough hard and put the dough on the chopping board. At this time, the dough will be very sticky and the surface will be very uneven. But keep kneading and don't add flour easily.

4. If the dough sticks to the chopping board, you can shovel the dough stuck to the chopping board with a plastic scraper and knead it into a big dough again.

5. Knead the dough, the dough will gradually become elastic and the surface will become smooth. Moreover, with the formation of gluten, dough will begin to become less sticky.