Wash starchy crops such as sweet potatoes, potatoes, and corn thoroughly and peel them.
Cut the starchy crops into small pieces and steam for 20 minutes.
Mash the steamed ingredients and place in a bowl.
Add eggs, sugar, milk, cake flour, and baking powder, then mix well.
Pour the batter into a cake pan and smooth it out.
Bake in a preheated oven at 180°C for 30 minutes.
After cooling, cut into pieces of desired size.