Sift all ingredients into a medium bowl, add in the chopped dark chocolate and stir until well combined.
Store the hot chocolate mix in an airtight container.
To make hot chocolate, add 1 heaped tablespoon of the mix to 250ml of milk (or non-dairy substitute) and microwave on medium high for 1-2 minutes.
Top with an extra dusting of hot chocolate mix, or add some whipped cream for a more indulgent twist.