It is important to start with a clean bowl. If unsure do a prewash - cover blades with water, add a dash of vinegar and prewash on universal.
Add milk to Thermomix bowl and heat: 5 mins/45℃/speed 1. Heat longer to reach 45℃ if needed.
Add remaining ingredients to Thermomix bowl, (sprinkle on the milk powder). Mix 5 secs/speed 4. Ensure everything is mixed through.
Pour into a container that has a lid (I use round pyrex one), and fits into the varoma dish comfortable with the lid on. Place container in the varoma dish and set aside.
Clean Thermomix bowl, add 250g warm water and 1 tbsp vinegar. Set bowl in position. Place Varoma on top of lid.
Select Fermentation Mode (find in your Modes) and ferment: 10 hours at 70℃.
Once done, transfer to the fridge to cool and thicken, at least 4 hours.
Notes
Recipe can be doubled
Dont worry if you need to leave the yoghurt longer - it will be happy for a few extra hours.
Remember to keep back 60g of yoghurt for your next batch