1. Mix flour, baking powder, baking soda, and cornstarch, sift and set aside
2. The powdered sugar, oil and egg yolk are weighed and put together
3. Beat and mix evenly
4. Pour the sifted powder and mix
5. Use the method of cutting and mixing to mix the egg liquid and powder into a looser ball
6. Divide directly into approximately 20g portions each, and place them on the baking tray for reunion
7. Press your fingertips into a natural cracking state
8. Put it in the middle and lower level of the preheated oven, and bake for 20 minutes at 190 degrees.
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