Got this recipe from one of the Japanese cooking sites. It is a lot different from typical American cookies, but I loved those. You probably don't want to eat too much as it contains lots of butter and sugar just like any other cookied do, but making them is certainly fun!
butter 1/4 cup
sugar 3 table spoon
milk 2 table spoon
flour little less than 2/3 cup
cocoa 1 table spoon
Leave butter in a room temperature until it is soft. Mix it sugar (little by little) until it gets creamy. Add milk (room temperature). Add flour and cocoa and mix well. Heat oven to 170C (approx 340F). Bake for 12-15 mins.
I also made the version with lemon zest. They were both pretty good!