Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Add the egg and vanilla extract, mixing until well combined.
In a separate bowl, whisk together the flour, matcha powder, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Scoop tablespoon-sized portions of dough and roll them into balls.
Place the cookie balls on the prepared baking sheet, spacing them about 2 inches apart.
Flatten each cookie slightly with your palm.
Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden.
Remove from oven and let cool on a wire rack before dusting with powdered sugar.