Preheat the oven to 170°C.
Sift the flour, cocoa powder, and baking powder together.
In a bowl, add eggs and sugar and whisk well using a hand mixer.
Add milk and melted butter, then mix.
Add the dry ingredients and gently fold with a spatula.
Pour the batter into the mold.
Bake in the preheated oven at 170°C for 30 minutes.
Let it cool, then cut into serving-sized pieces.