Sift the matcha powder and cake flour together and mix.
Add eggs and sugar to a bowl and whisk together.
Pour in milk and melted butter, and mix well.
Add the flour mixture and fold in with a spatula.
Pour the batter into a pan and smooth the surface.
Bake in a preheated oven at 170°C for 20 minutes.
After cooling, decorate with sweet red beans and dark chocolate.