Bring a medium pot of water to a boil and add your chopped cauliflower. Boil for about 10 minutes, until cauliflower is tender and soft. Drain and pat dry with a towel.Add hot cauliflower to your food processor and add chicken stock, Greek yogurt, olive oil, garlic and cheeses; process until completely smooth. Feel free to add a touch more Greek yogurt as needed for creaminess.Stir in salt, pepper and rosemary and enjoy!