Wash the sweet pumpkin thoroughly, remove the seeds and skin, then cut it into small pieces.
Steam the sweet pumpkin, let it cool, and mash it until smooth.
Add eggs and sugar into a bowl, and whisk thoroughly until well mixed.
Add the mashed sweet pumpkin, milk, and cooking oil, then mix well.
Sift cake flour and baking powder into the mixture, then fold gently using a spatula.
Pour the batter into a cake mold.
Bake in a preheated oven at 180°C (356°F) for 30-35 minutes.