Servings: Serves 8–10
Ingredients 1 tablespoon extra-virgin olive oil1 medium onion , finely chopped2 ribs celery , finely chopped3 cloves garlic , minced3 medium zucchini , scrubbed but unpeeled, cut into 1/2-inch cubes (1 cup)1 medium Yukon Gold potato , peeled and cut into 1/2-inch cubes (1 cup)3 cups chicken broth or canned low-sodium broth , as needed1 sprig of fresh thyme1 cup evaporated skim milk3 tablespoons freshly grated Parmesan cheese , plus additional for servingSalt and freshly ground black pepperChopped fresh thyme , for garnish
Heat the oil in a large pot over medium heat. Add the onion, celery and garlic, and cover. Cook, stirring often, until the onions are translucent, about 5 minutes.
Stir in the zucchini and potato. Add enough broth to barely cover the vegetables. Add the thyme and bring to a boil over high heat. Reduce the heat to low. Simmer, partially covered, until the potato is tender, about 15 minutes.
Stir in the evaporated milk and cheese. Heat until very hot, but do not boil, or the soup will curdle. Season to taste with salt and pepper.
Ladle into soup bowls, and sprinkle each serving with thyme. Pass extra Parmesan cheese on the side. Serve hot.