Preheat the oven to 170°C (338°F).
Sift the matcha powder and cake flour together.
Mix egg yolks, sugar, milk, and melted butter.
Combine the sifted dry ingredients to make the batter.
Add sugar to the egg whites and beat until stiff peaks form to make meringue.
Fold the meringue into the batter in two additions.
Pour the batter into the pan and smooth the top.
Bake in the oven for 25 minutes.
After cooling, add powdered sugar or cream as desired.