1. Prepare the ingredients (I did double the amount)
2. Mix milk, sugar, corn oil and stir well
3. Sift in low powder
4. Zip and mix until there is no dry powder, then add egg yolk
5. Mix in the same method until evenly, and the egg yolk paste is ready
6. Add a few drops of lemon juice or white vinegar to the egg whites and beat them upright
7. The beaten egg whites are mixed with egg yolk paste three times
8. Stir the cake batter evenly and it's done
9. Put it into a piping bag and squeeze it into the mold to shake out bubbles
10. Preheat the oven, the middle layer will be heated at 150 degrees, 20 minutes (operate according to the actual temperature of the oven)
11. It's out
