Preheat oven to 400 F. On two rimmed baking sheets place the carrot, parsnips, and onions on one and the yams and sweet potatoes on the other.
Drizzle with olive oil, salt, and pepper and toss.
Bake in the oven for 20 min.
Toss the vegetables and continue to bake until tender and starting to brown 10-15 min. The yams and sweet potatoes may be done first so that is why they were divided.
Meanwhile, in a large pot add the 1 Tbsp. olive oil and saute the garlic for 1-2 min. until fragrant.
Add the chicken stock and simmer for 10 min. Add the vegetables and nutmeg and simmer for 10-15 min. again. Adjust seasoning.
Using a handheld immersion blender, blend until smooth. Stir in cream and heat until just simmering. Serve.