Step 1: Weigh the required ingredients and soften the butter in advance.
Step 2: Add powdered sugar and sugar to the butter, then beat with an electric mixer on low speed until fluffy and white.
Step 3: Then add the egg mixture in two batches, and after each addition, beat the egg mixture and butter with a whisk until combined, then add the next addition.
Step 4: Sift the flour into the whipped butter.
Step 5: Mix with a spatula until no dry flour remains.
Step 6: Put the batter into a piping bag with an eight-tooth nozzle.
Step 7: Line a baking sheet with parchment paper and squeeze the cookies clockwise.
Step 8: Preheat the oven to 170 degrees Celsius and bake in the center on upper and lower heat for about 25 minutes.
Step 9: Bake until the cookies are golden brown on top, then transfer to a baking sheet to cool.