No oven! No machine! How to make Custard Cream Pancake

No oven! No machine! How to make Custard Cream Pancake
Dough
180g soft flour (cake flour)
2eggs
200g milk
30g sugar
2g salt
30g cooking oil
3g baking powder
Custard cream
3 yolks
300g milk
60g sugar
20g corn starch