Winter Potato-Leek Soup

Name: Winter Potato-Leek Soup
Cuisine: American
Ingredients: 2 leeks (white parts only), cut into ¼-inch pieces (2 cups); ½ small onion, diced (½ cup); 6 cloves garlic, minced; 6 medium potatoes (any variety), peeled and cut into ½-inch dice (2 lb.); 3½ to 4 cups vegetable broth; 1 bay leaf; 1 sprig thyme; 1 cup unsweetened, unflavored plant-based milk; 1 tablespoon white wine vinegar; 1 tablespoon nutritional yeast; Sea salt and freshly ground black pepper, to taste; 1 tablespoon chopped fresh parsley; ¼ cup roasted chestnuts, chopped