1. Weigh the materials and spare
2. The sweet potatoes are steamed and pressed into a puree.
3. Sift into the sweet potato with low flour, add brown sugar and baking powder. Remember to melt the sugar
4. Add the butter, stir to form a paste, and add the raisins. Add a few drops of vanilla extract.
5. Spread greased paper on the baking tray and spread the mashed sweet potato into a small round cake shape. Preheat the oven, 180 degrees, 10 minutes.
