Roasting the mushrooms adds a depth of flavor to this Thermomix recipe for roasted mushroom soup. The Thermomix helps to blend the roasted mushrooms into a smooth and silky soup. This soup is made with a combination of button mushrooms, cremini mushrooms, and portobello mushrooms. The mushrooms are roasted with garlic and thyme to bring out their natural sweetness. Vegetable broth and cream are added to create a creamy and comforting texture. Serve this roasted mushroom soup with a sprinkle of fresh parsley and a dollop of sour cream.