Preheat the oven to 180°C (356°F).
Sift together flour, cocoa powder, and baking powder.
Cream the butter and sugar until smooth.
Add the eggs and mix well.
Pour in the milk and stir to combine.
Add the dry ingredients and mix until the batter is smooth.
Pour the batter into the mold.
Bake in the oven for 25 minutes.