Steamed creamy custard bun 奶黄包 (nai huang bao)

1. Place custard powder, sugar and milk powder in a bowl. Add coconut milk, whisk until sugar dissolved. Add evaporated milk, stir to combine.
2. Add 1 egg at a time, whisk until incorporated.
3. Add the melted butter.
4. Sieve the liquid. Pour into a lightly grease pan (like A) and steam for 15-20 mins. (it depends on your steamer)
5. Take the pan out from steamer and mash the custard until it is crumble (like C) and knead the custard on clean work surface until smooth (like D).