1. Butter room softening
2. Use a manual whisk to beat until smooth, don’t whip
3. Add sugar, preferably powdered sugar_I only have white sugar at home, I'm lazy to powder it, no wonder
4. Continue to stir evenly with a manual whisk, and beat slightly
5. Add the egg whites in three batches, and stir evenly after each addition
6. Mix the milk powder and flour evenly
7. Sift into the egg batter three times with a sieve
8. Stir evenly after each sieve, then sieve again
9. Finally, just stir the batter well, don’t overdo it
10. Air fryer or oven preheat 140 degrees or 150 degrees
11. Prepare piping bag and piping mouth. I heard that cookies are difficult to squeeze, so I used cloth and filled the batter.
12.
Line the frying basket with greased paper and squeeze it in the shape you like.
No matter how ugly it is, don't squeeze it again and again, because it will be very hard when baked. Don't ask how I know.
13. Finally, wait for the cookies to be colored at 140 or 150 degrees for about 20 minutes, depending on your oven temperament.
