Creamy Sweet Potato Soup Recipe

Ingredients

• 2 tablespoons butter
• 1 medium onion, chopped (about 1 cup)
• 2 celery ribs, chopped
• 1 medium leek, white and light green parts only, sliced (see How to Clean Leeks)
• 1 clove garlic, chopped (1 teaspoon)
• 1 1/2 pounds (about 2 large) orange-flesh sweet potatoes (a.k.a. yams), peeled, cut into 1-inch pieces (about 5 cups)
• 4 cups chicken stock (use vegetable broth for vegetarian option)
• 1 cinnamon stick
• 1/4 teaspoon ground nutmeg
• 1/4 cup heavy cream
• 3/4 cup milk
• Salt
• Pepper
• 1/4 cup sour cream or plain yogurt