Cream butter and sugar.
Add self raising flour and milk (preferably add 1 tsp DigestEasy into milk OR ½ tsp of Bake Aid into milk to digest gluten in flour and casein in milk for people with food intolerance).
Add choc bits and mix through.
Roll into balls and squish down gently onto baking tray and place in 170° (fan forced) oven for 10 minutes. You don’t want them to go brown. Should be slightly firm as they will get harder when they cool.