Preheat oven to 170C.Melt the butter in the microwave (proper bakers feel free to gasp here), so that all the tools you will need is a wooden spoon. In a bowl, cream the melted butter with the sugars and add the mint and vanilla extracts. Add the egg, the matcha (sifting is the best way), the maca powder, the salt and the baking powder. Combine well. Add the flour. (Sifting it is better but not necessary.) Finally, add the choc chips and combine well.Cover a baking tray with baking paper and evenly place 9 little balls (bit smaller than a golf ball) on it. Bake them for 8 minutes only, I kept checking on them: when they are getting a light golden shade (that’s how they are getting their lovely crispness), they will be just perfect.Leave them to harden and cool for a few minutes before transferring them to a plate. I think they are the best when still a bit warm, but they also store well. But they are always gone in no time