1. Weigh all materials
2. Soften the butter, add in sugar and milk powder
3. Dispense until the volume is fluffy and the color becomes lighter
4. Add the egg yolk twice, and add the next time after mixing well each time
5. Sift in low-gluten flour
6. Stir evenly, add raisins and knead it into a dough
7. Use a rolling pin to roll into a sheet of about one centimeter
8. Cut into small rectangles, put on a baking tray, brush with egg yolk
9. Put it in the preheated oven, middle level, upper and lower heat, 170 degrees, about 15 to 20 minutes
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