Instructions
1. Sift cornstarch, cake flour, and green tea powder together. Set aside.
2. Beat soft butter in a mixing bowl. Add powdered sugar and sugar and mix.
3. Add yolks and milk and mix well. Add flour mixture and mix (don't over mix).
4. Let the dough rest for 30-60 minutes in the refrigerator.
5. Roll out dough to 1/4" thick and cut out with cookie cutter.
6. Bake at 350F (175C) in preheated oven for 10-13 minutes.
7. Cool completely on cookie rack, and decorate with chocolate if you want