1. Butter greenhouse softening
2. Add powdered sugar
3. Stir them well (don't send them)
4. Add the egg whites in three times (Stir well after each addition, and then add the next time, as long as it is evenly stirred)
5. After mixing, it is a fine and fluid paste
6. Sift in all-purpose flour
7. Mix the flour and paste evenly. (Don't stir it too much, just evenly)
8. Prepare round piping mouth and piping bag
9. Put the piping mouth into the piping bag
10. Put the mixed batter into the piping bag
11. Squeeze strips of batter on the baking tray and put them in the preheated oven to bake
Tips:Baking conditions: the upper layer of the oven, the upper and lower fire, 160 degrees, about 15 minutes, bake until the edges of the biscuits are golden
