You can use the food processor with the metal blade for powdering this hot chocolate mix. I used the chutney jar of my mixer/ blender (most Indian kitchens have this appliance) and it works excellently here for making a finely powdered mix.
It is important to have your chocolate chopped finely (you can grate it too if you prefer that) as it means you have to process it less.
Put all the ingredients together in a big bowl and whisk to mix it together. If you are using the food processor then just pulse a couple of times and the process it until you have as fine a powdery mixture as possible. Even if it is a slightly coarse powder, that fine as it will dissolve when mixed with hot milk.
If youu2019re using your blender/ mixer as I did, powder the whisked mixture in small batches as fine as possible. If the jar warms up your hot chocolate mix will form clumps which is not desirable!
Transfer the mix to an airtight container (or smaller ones if gifting). This recipe makes 5 cups powdered hot chocolate mix, and should keep for about 6 months.