Preheat the oven to 400 degrees F. Peel and coin the parsnips. Cut cauliflower into florets
Place cauliflower and parsnips in a roasting pan. Toss with olive oil. Roast, uncovered, stirring every 10 minutes or so, until vegetables are browned and tender.
Remove pan from oven. Add minced garlic. Cover with foil and let sit 10 minutes.
Remove foil, let vegetables cool, then pour all into blender. Add cream and broth to blender.
Blend on Puree setting until smooth.
Pour back into pot. Heat.
Add salt, pepper, thyme and sage to taste. Heat and serve in bowls.