Beat eggs and sugar together until foamy.
Sift cake flour into the batter and mix well.
Add melted butter and milk, then combine evenly.
Pour the batter into a pan, bake in the oven, and let it cool.
To make the custard cream, mix milk, egg yolks, sugar, and flour, then bring to a boil.
Once the cream forms, spread it over the cooled cake.
If desired, finish by dusting powdered sugar on top.