The materials to be prepared in advance include: 5 eggs, 9g sugar and 9g low-gluten flour.

1. Sieve the low-gluten flour.

2. Add sugar to the egg whites, beat with an egg beater until wet and foamed, and add the egg yolk.

3. Beat until the egg paste is thick

4. Add the low-gluten flour and mix it up and down evenly.

5. Brush the container with oil, pour in the egg paste and shake it twice to shake out the big bubbles.

6. Put it in a microwave oven for 2 minutes and medium fire for 2 minutes.

7. Take out the upside-down button and let it cool, so that the cake is ready.