Place the eggs and sugar in a bowl and whisk until light and fluffy.
Add the warm, double-boiled milk and vegetable oil, and mix well.
Sift in the cake flour and cocoa powder, and mix until evenly combined.
Pour the batter into the mold and tap it a few times to remove any bubbles.
Bake in a 170°C oven for 30-35 minutes until done.