Preheat the oven to 180°C (356°F).
Sift together flour, cocoa powder, and baking powder.
In a bowl, whip eggs and sugar until foamy.
Add milk and melted butter, mixing well.
Gently fold in the dry ingredients until smooth.
Pour the batter into a cake mold.
Bake in the oven for 30 minutes.
Let it cool to finish.