Gather and weigh out all your ingredients.
Split your vanilla pods in half. Using a smooth-bladed knife, scrape out all the seeds and add them to the cocoa powder and mix them in.
Sift the potato flour, cornflour and icing sugar together.
Transfer this to a large plastic food bag and add in the grated chocolate.
Also add the cocoa powder to the mix. Close the bag and give it a good shake.
Transfer the powder to a 250 grams sterilized glass jar.
I used a larger one, as this is all I had on hand and it gives me an excuse to make even more just to fill up the jar :)