Preheat oven to 330F.
Mix flour, matcha powder, and baking soda together and sift. Set it aside.
Place butter in a bowl and melt it in a microwave. Add sugar and egg and mix well.
Mix in the powdered ingredients and mix well with a spatula. Add the chocolate and mix more.
Line cookie sheet with a baking paper and place the dough. Bake in oven for 6-8 minutes.