Bring stock to boil in large heavy saucepan. Add SweeTango apple halves, sweet potatoes, onion, peppers and butter. Reduce heat; simmer, covered, until apples and sweet potatoes are very soft, about 25 to 30 minutes. Turn off heat to cool slightly.
In batches, purée the contents of the saucepan in a food processor or blender until smooth. Return soup to saucepan. Add salt and pepper to taste. Serve hot. Makes 8 servings.
Enjoy the soup for its pure deliciousness, or top with a dollop of sour cream, fresh cilantro or cubed SweeTango apples.
*To make this soup vegetarian, sub out the chicken stock for vegetable stock.