1. Weigh all the ingredients, put the egg yolk and sugar into a bowl, and put milk powder and corn starch into a bowl
2. Put the egg yolk in sugar and beat with a whisk until the volume becomes larger and the color becomes lighter
3. Sift in milk powder and cornstarch
4. Mix well
5. Put it in a piping bag (put in the medium round piping mouth in advance)
6. Squeeze out a small circle about one centimeter (be sure to put a silicone mat on the baking tray, otherwise the baked biscuits will not be easy to take off)
7. Preheat the oven at 150°C for 10 minutes, put it in the baking tray and turn at 120°C and bake for 20 minutes, then simmer for 20 minutes and take it out
