1. After preparing all the ingredients, the egg yolk, sugar, oil and milk, stir well.
2. Sift in the cocoa powder and cake mix.
3. Stir well.
4. Add egg whites with cream of tartar and beat until short and pointed (hard beat).
5. Add the egg white batter to the chocolate batter three times.
6. Stir evenly with a spatula.
7. Pour into the baking tray and bake at 180 degrees for 9-12 minutes.
8. After cooling, apply whipped cream.
9. Roll up, refrigerate, and cut into pieces after 4 hours.
10. Sprinkle a layer of cocoa powder.
11. Super delicious!
Tips:The whipped cream needs to be used up as soon as possible after each opening, otherwise it will quickly break, but there is a way to keep it for a long time, at least I use it well!
Add the whipped cream with sugar to adjust the taste you want, then put it in a container after passing it, freeze it, and use it next time as long as it is melted out in advance.
