Roast the hazelnuts in a preheated air fryer for 3 mins at 180°C (you can also use the oven, though the time will be longer).
Add roasted hazelnuts, dates, cacao powder, and a optional pinch of salt to the large bowl of the @magimixuk food processor.
Blitz/blend for a few minutes (~3-5 mins) until the mixture goes from crumbly to a uniform dough.
Take a tablespoon of the mixture and roll it with your hands to form a ball. Lay on a plate with baking paper and repeat with the rest of the dough. This recipe makes 16 balls.
Add the whole hazelnut on top of each ball. Chill in the freezer for a few minutes to allow the dough to set and harden, ready for the final step.
Melt the dark chocolate in a bowl, then roll each ball in it to coat completely.
Transfer to a plate lined with baking paper, and once all balls are coated, freeze for a few minutes until the chocolate hardens.