In a large bowl, beat butter, brown sugar and white sugar. Beat until creamy, about 2 minutes.
Add egg, vanilla extract and beat until combined, scrape the bottom and sides as needed.
In a separate bowl mix flour, matcha powder, baking soda and salt.
Add flour mixture into the butter mixture. 1/2 at the time, mix until combined.
Stir in chocolate chips.
At this stage if dough is too soft, cover and refrigerate for 20 minutes.
Preheat oven to 350°F (175°C). line two baking trays with parchment paper.
Scoop the dough onto a prepared baking sheet, leaving at least 3 inches (7.5 cm) of space between the cookies.
Refrigerate for 30-40 minutes.
Bake for 10-12 minutes, or until slightly golden around the edges.
Allow to cool before serving.