Add milk, milk powder, vanilla and yogurt to Thermomix bowl and mix7 secs/speed 4
TM6 method
TM6 - gently pour mixture into a container that has a cover and fits into the varoma.
Add 1 ltr water to Thermomix bowl and add 1 tbsp vinegar.
Place container into Varoma dish and select fermentation mode for 8 - 10 hours.
TM5
Pour yogurt mix gently into a Thermoserver and wrap in a towel to keep extra snuggly. Place in a warm spot to ferment for 8 - 10 hours. The success with the TM5, is trying to find that warm spot to let it ferment.
Notes
Recipe can be doubled
Make sure you start with a really clean bowl and clean environment
You can leave the yogurt longer to ferment if needed, longer
Success with the TM5 relies on finding that nice warm spot where your yogurt will not be disturbed
Remember to keep back 60g of yogurt for your next batch