Required materials: yam 100g, 7-8 blueberries, egg 1 each, flour 100g, and yeast 2g.

Specific practices:

1. Steamed yam, pressed into mud, added with 5g of sugar, mixed with egg yeast powder, and pressed into dough.

2. Knead into long strips, cut into small doses, pressed into the shape of small cakes, and sent to the oven for fermentation. The fermentation time is 50-60 minutes, which is twice as long as the original.

3. After the fermentation is completed, put it in the oven 160 degree baking 16 minutes.