1. Turn the purple sweet potato into a puree in the microwave for 12 minutes, take 420G
2. Eggs and brown sugar, butter softened and salted, low powder and baking powder sifted
3. Whip the eggs and brown sugar lightly and evenly
4. Stir the butter and powder evenly
5. Add the egg batter and stir evenly
6. Stir in the mashed purple potato in portions
7. Pick the vanilla extract and mix well
8. Load the mold 7 minutes full
9. Preheat the oven at 180 degrees, bake for 40 minutes, cool for 5 minutes, pour out the mold, and pack it into a box.
