Preheat your oven to 350°F (175°C).
In a bowl, cream together the softened butter and granulated sugar until light and fluffy.
Add the egg and vanilla extract, mixing well.
In another bowl, whisk together the flour, matcha powder, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Use a cookie scoop to drop dough onto a lined baking sheet.
Flatten each dough ball slightly with the back of a spoon.
Bake in the preheated oven for 10-12 minutes or until 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.