Place the halved onion into the Thermomix bowl. Chop on Speed 5, 5 seconds. Scrape down the sides of the bowl.
Add the olive oil and minced garlic and saute for 3 minutes, Varoma, Speed 1.
Add the chopped pumpkin, sweet potato, potato, water (see notes) and chicken stock powder and cook for 30 minutes, 100 degrees, Speed 1.
Allow to cool slightly (see notes). Very slowly turn the speed up to Speed 4 then continue to slowly increase to Speed 9 for 30 seconds or until smooth.
Add the cream, season with salt and pepper and heat for 3 minutes, Speed 1, 80 degrees.
Serve with hot crusty bread.