Preheat oven to 190°C.
Sift the flour, cocoa and baking powder together.
Beat eggs and milk together.
Make a hollow in centre of dry ingredients and add butter, milk mixture and chocolate.
Add just enough liquid to moisten the flour.
Mix lightly, batter can still be lumpy.
Spoon into a greased muffin pan and bake for 20 - 25 minutes. Serve warm.