Only recipe in our book is this:
1 litre long life milk
1 individual tub, (125g.) natural yoghurt
sugar to taste
place milk and sugar in THX mix 10 seconds Speed 4 and then program 3 mins 80º Speed 2 and 1/2. When it finishes add yoghurt and mix speed 3 a few seconds.
Leave in THX with MC on lid, cover with 2 tea towels and leave for 8 hours.
If you want thicker yoghurt add a measure of the MC of powdered milk.