Preheat the oven to 180°C.
Sift together the flour, cocoa powder, and baking powder.
Cream the butter and sugar until smooth.
Add the eggs and mix well.
Alternately add the dry ingredients and milk, mixing into a batter.
Fold in chopped chocolate.
Pour the batter into a pan.
Bake in the oven at 180°C for 30 minutes.
Remove the cooled cake from the pan once finished.