1. Beat protein: Beat protein with electric egg beater at low speed until wet and foaming. Add fine sugar in three times and continue to send it at high speed. Put a chopstick in the middle, and you'll be done if you don't fall.
2. Mix the egg yolk paste: break the egg yolk with a hand mixer, then add the milk and mix well. Add vegetable oil in stages and stir well. Sieve the flour, add it into the yolk paste and stir until there are no particles.
3. Mixing: Pour13 of the protein paste into the egg yolk paste, stir evenly with a spatula, and then pour into 2/3 of the protein paste. Gently cut it up and down with a scraper to mix it evenly. Don't circle, lest the batter thicken.
5. Spoon the cake paste into the paper cup, gently shake it and put it in the oven 120℃ 10- 15 minutes.
I hope it helps you.