Using your blender, add all the roasted veggies. Blend it until creamy. Always make sure that, according to the manufacturer of your blender, you should avoid hot liquid. If that is the case, just wait a bit to cool it down before blending. Safety first!
Purée until smooth and transfer to a large pot. Place the pot on the stove and add vegetable stock (or chicken stock) and heavy cream.
Cover the pot with a lid and cook on medium heat for 5-10 minutes, stirring regularly. taste for salt and pepper or any other spices you desire to add. I kept it simple as is, and the soup shines. But if you want, you can add some more nutmeg and cinnamon.
If the soup is too thick, add more stock as needed until the desired consistency is reached. And voila! You will end up with a smooth, thick, delicious-looking pumpkin sweet potato soup!