In 4-quart saucepan, heat oil over medium-high heat. Cook onion in oil about 2 minutes, stirring frequently, until tender.
Add pork and chili powder; cook and stir about 4 minutes or until pork is no longer pink.
Stir in remaining ingredients. Reduce heat to medium-low. Cover and simmer 15 to 20 minutes or until sweet potatoes are tender.