Preheat oven to 375°F (190°C). In a small bowl, stir together flour, matcha green tea powder, baking soda, and baking powder. Set aside.
In a large bowl, cream together the butter and sugar until smooth. Beat in egg and vanilla. Gradually blend in the dry ingredients. Roll dough into balls about the size of ping pong balls and place onto ungreased cookie sheets.
Bake 8 to 10 minutes in the preheated oven. Let stand on cookie sheet two minutes before removing to cool on wire racks.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.