01 - Preheat oven to 350°F. Grease an 8-inch round cake pan and line the bottom with parchment paper.
02 - In a medium bowl, whisk together the all-purpose flour, matcha powder, baking powder, and salt.
03 - In a large mixing bowl, beat the unsalted butter and granulated sugar until light and fluffy, approximately 3 minutes.
04 - Add the eggs one at a time, mixing thoroughly after each addition. Stir in the vanilla extract.
05 - Gradually add half of the dry ingredient mixture to the wet ingredients, mixing until just incorporated. Pour in the milk, then fold in the remaining dry ingredients until a smooth batter forms.
06 - Pour the batter into the prepared cake pan and smooth the top using a spatula.
07 - Bake for 28 to 32 minutes, or until a toothpick inserted into the center comes out clean.
08 - Allow the cake to cool in the pan for 10 minutes, then invert onto a wire rack to cool completely.
09 - If using the topping, whisk the powdered sugar and matcha powder together, then dust evenly over the completely cooled cake.