材料Ingredients：
1)牛油Butter 250gm
2)糖粉Icing sugar 100gm
3)马铃薯粉Potato starch 200gm
4)普通面粉Plain flour 150gm
5)可可粉Coco powder 1tbs(6gm)
6)绿茶粉Green tea powder 1tbs(6gm)

160 度烤20分钟
160'c bake for 20 minutes