Preheat the oven to 180 C / 160 C fan / Gas 4. Line two 12-hole muffin tins with paper cases.
Beat sugar and margarine together in a large bowl until really light and creamy. Beat in vanilla extract followed by the eggs, one at a time.
Sift the flour and nutmeg together then add to the butter mixture. Gently mix in the Baileys® and the chocolate chips until smooth - be careful not to over mix! Divide mixture equally between paper cases, filling only to half way to ensure a good rise; tap tin gently on counter top to get rid of any air bubbles.
Bake one tray at a time in the preheated oven on the middle shelf for 18 to 20 minutes until a skewer inserted into the centre of a cake comes out clean. Remove from the oven and leave to cool in tin for about 10 minutes. Cook the second tray. When cooled, remove gently and cool completely on a wire rack. Enjoy!
I actually made this using my Kenwood mixer, Let me know if anyone has any problems with this recipe on firstname.lastname@example.org. Thanks