Peel the sweet potatoes, boil them, and mash.
Add eggs, sugar, and milk to the mashed sweet potatoes and mix well.
Sift flour and baking powder into the mixture and combine.
Melt the butter and add it to the batter, mixing thoroughly.
Pour the batter into a mold and smooth out the top.
Bake in a preheated oven at 170°C for 35 minutes.
Let it cool completely, then cut into serving pieces.