In a bowl whisk together the melted butter, dark sugar, caster sugar, milk and vanilla paste
Add the remaing ingredients; flour, baking powder, bicarb powder and chocolate
Mix together - then form 18 55g dough balls
Place on a tray and chill in the fridge till the dough balls are solid - leave these in the fridge for 48 hours for the best flavour
Heat oven to 180c
Place balls on tray and leave at room tempreture for 10 minutes
Bake for 12 minutes - for a softer cookie take out at 12 minutes for a crispier cookie leave in the over for a few minutes longer
Allow to cool before digging in