Preheat the oven to 180°C.
Sift together flour, baking powder, and cocoa powder.
In a bowl, cream the butter and sugar together.
Beat the eggs and mix them in well.
Add milk and make the batter.
Add the dry ingredients and mix evenly.
Fold in the chocolate chips gently.
Divide the batter evenly into muffin tins.
Bake in the oven at 180°C for 20 minutes.