1. The purple sweet potato is peeled and steamed in the pot and then mashed into a puree
2. Add milk, flour and white sesame seeds, mix well and knead into a dough
3. Put it in a fresh-keeping bag and roll it into a dough sheet with a thickness of 3 mm
4. Cut into small pieces, use a fork to make a hole, put in the oven at 170 degrees and bake for 20-30 minutes
5. The purple sweet potato biscuit with crispy outer skin and soft inner is ready
6. You can eat it during fat loss
