1. Put the butter in the frosting after softening at room temperature
2. Stir with an electric whisk
3. Put in two eggs
4. Whisk continue to stir until well mixed
5. Sift low-gluten flour and milk powder and add
6. Knead until the surface of the dough is smooth
7. Put the plastic wrap on top and bottom and roll it into a 0.2-0.4cm thick pie, refrigerate for 15 minutes
8. Use a cookie mold to press out the shape, and the surface is glaring
9. Put it in the oven at 170 degrees and bake for 15-20 minutes (adjust the time according to the thickness of the biscuit)
10. After baking, take it out and let it cool, and draw a simple pattern on the biscuits
11. Manually beat the egg whites until frothy
12. Sift the icing sugar and add it to the egg whites
13. Stir until thick
14. Separate several small bowls, add edible coloring
15. Stir the food coloring evenly
16. Put it in a piping bag and cut a small mouth at the front
17. Squeeze the frosting onto the biscuit and spread it evenly with a small steel needle
18. Let stand for 10-20 minutes, the icing sugar solidifies
19. Put all to cool and put into a biscuit bag to plastic seal
20. Let's have cookies on Christmas Eve
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