Line 2 baking sheets with paper.
Place sugar, milk, butter, cocoa and salt into the Thermomix bowl and bring to the boil, 5 min/Varoma/speed 1.
Add remaining ingredients and mix 30 sec/speed 5.* Finish combining with a spatulahlah if needed.
Dollop spoonfuls of the mixture onto the prepared trays and place into the fridge for a couple of hours. When they are ready to be touched without being too sticky, roll into neat balls and if you like roll in more cacao nibs. I went light on the cacao nibs for the pic, but it does help them be less sticky.
Serve when set. They can be transferred to a container and kept in the freezer.