1. Soften the butter, add powdered sugar and mix well
2. Add eggs and beat well
3. Sift in flour and mix well
4. Wrap the dough in plastic wrap and put it in the refrigerator
5. Roll out the dough about 5mm thick
6. Cut with a knife or cut out the shape with a mold, put it into a baking tray, preheat the oven 180°, and heat the middle layer up and down for 15 minutes
7. Beat the egg whites
8. Add powdered sugar and mix well
9. Add color to adjust color
10. Just draw a pattern on the biscuit
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