Mushroom and leek soup is a flavorful and aromatic dish that combines the earthy taste of mushrooms with the delicate sweetness of leeks. This recipe typically uses ingredients like cremini mushrooms, leeks, onions, garlic, and thyme. To make this soup, start by sautéing onions, garlic, and thyme in butter until fragrant. Then, add sliced cremini mushrooms and leeks, and cook until they release their moisture. Next, add vegetable or chicken broth and simmer until the mushrooms and leeks are tender. Finally, blend the soup until smooth and season with salt and pepper to taste. Serve this mushroom and leek soup hot with a drizzle of olive oil and a sprinkle of fresh thyme leaves. It's a comforting and elegant dish that is perfect for any occasion.