1. All preparation materials
2. After the butter is softened, pour in powdered sugar and salt
3. Beat with a whisk until the color is light white
4. Add the egg whites three times
5. Hit until the volume is enlarged
6. Pour cocoa powder into low-gluten flour and mix well
7. Sift into the butter and mix well with a spatula
8. Put the batter into the piping bag
9. Put greased paper in the baking pan
10. Squeeze out your favorite pattern
11. Preheat the oven at 180 degrees in advance, heat the upper and lower middle layers, put them in the baking tray and bake for 15 minutes
Tips:1. Butter can be cut into small pieces in summer to soften, and in winter, it can be cut into small pieces and can be blown to soften with a wind blower.
2. Add the egg whites to the butter three times, each time it must be beaten until the egg and butter are completely fused before adding the next time
3. The temperature of each oven is different, please control the temperature and time according to the actual temperature of your own oven
