Preheat oven to 160'C fan or 180'C conventional
Cream your butter, vanilla, and sugars together until combined, then add in your milk and mix.
In a separate bowl, mix your flour, cocoa, baking powder, bicarb, and salt
Sieve your dry mix into the butter, sugar, milk mixture
Mix until incorporated
Fold in your chopped chocolate/chunks
Spoon even amounts of dough and form into a ball. Place 2 inches apart to allow them to spread whilst baking. I weigh my cookie ball out at 40g each to ensure even baking, this makes 14 cookies. Bake for 18 mins for this size - the edges should be slightly firm to the touch. (Smaller cookies will need less time and larger will need more)
Cool for 5 minutes before transferring to a wire rack, then allow to cool completely
