Working in two batches, pulse ingredients in food processor until chocolate is finely ground.
Store in airtight container for up to 3 months.
Too make hot cocoa, stir 1/3 cup of the mix into 1 cup of hot (not boiling) milk.
Top with whipped cream or mini marshmallows and a little chocolate powder. I sometimes use cinnamon or nutmeg powder, instead. A little brandy and a crackling fire make for a real treat!