Preheat your oven to 350°F (175°C).
In a bowl, whisk together flour, matcha powder, baking powder, and salt.
In a separate bowl, cream the softened butter with granulated and brown sugar until light and fluffy.
Beat in the egg and vanilla extract until well combined.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Scoop tablespoon-sized amounts of dough onto a baking sheet lined with parchment paper.
Flatten each cookie slightly with your fingers.
Bake for 10-12 minutes, or until the edges are lightly golden.
Remove from the oven and let cool on the baking sheet for a few minutes.
Dust with powdered sugar before serving.