Preheat the oven to 350°F (175°C).

In a mixing bowl, whisk together the flour, baking powder, matcha powder, and salt.

In another bowl, cream the softened butter and sugar until light and fluffy.

Add the egg, lemon zest, and lemon juice to the butter mixture and mix until combined.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Drop tablespoons of dough onto a baking sheet lined with parchment paper.

Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden.

Allow the cookies to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.