Preheat the oven to 180°C (356°F).
Sift cake flour, cocoa powder, and baking powder together.
Whip eggs and sugar until foamy.
Add the sifted dry ingredients, milk, and melted butter to the whipped eggs and mix until combined.
Pour the batter into a cake pan.
Bake in the oven at 180°C (356°F) for 25 to 30 minutes.
Cool the cake and slice it into two layers.
Whip cream and sugar until foamy, then spread between the cake layers.
Finish by spreading whipped cream on top of the cake.