1. Add sugar to the egg yolk and stir
2. Put milk and whipped cream in a saucepan, boil slightly over low heat and cool
3. After mixing in vanilla extract, sift the dough
4. Pour the right amount of dough into the oven-specific container, put it in the pan of the oven, and pour hot water
5. Bake in an oven preheated to 160 degrees for about 30 minutes
6. After the heat dissipates, sprinkle with sugar, then mix the sugar with a spoon to finish
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