2. Add 50g sugar, yogurt and corn oil to the egg yolk and stir well.

3. Sieve in a small amount of powder

4. Stir well again until it is bright yellow and has no graininess.

5. Add *** 1 10g sugar to the egg white and beat for two or three times until it is dry and frothy, as shown in the figure.

6. Add one-third of the protein paste into the protein paste and stir it evenly, then turn it up and down with the rest of the protein paste and stir it evenly.

7. Bake in the middle and lower oven 160 degrees for 45 minutes, and put the baking tray on the top layer to prevent it from being too dark in half.

8. Take it out of the oven and hang it for a while.