1. Heat oil in large pot over medium heat. Add carrot and celery; sauté until starting to soften, about 5 minutes. Add cooking liquid, beans, tomatoes with juice, 3 tablespoons cheese, garlic, and Italian seasoning.
2. Simmer, uncovered, 30 minutes. Puree 2 cups soup in blender. Return puree to pot. Ladle soup into bowls; top with toasts. Drizzle truffle oil over; sprinkle with cheese.
3. Per serving: 395 calories, 19 g fat, 8 g fiber Nutritional analysis provided by Bon Appétit