Roasting mushrooms brings out their natural flavors and adds a depth of flavor to this delicious soup. This roasted mushroom soup is made by roasting a variety of mushrooms with garlic, thyme, and olive oil until they are golden and caramelized. Then, they are blended with vegetable broth and a touch of cream to create a velvety smooth soup. Garnish with fresh herbs and a drizzle of truffle oil for an extra touch of elegance.