Honey Mustard-Whipped Sweet Potatoes

Recipe courtesy of Cooking Light.

Ingredients:
1 tablespoon margarine
1/2 cup sliced onion
3 medium sweet potatoes, peeled and cut into 1-inch pieces (about 1 1/2 pounds)
1 tablespoon Dijon mustard
1 tablespoon honey
1/4 teaspoon pepper
1 cup low-salt chicken broth

Directions:
Melt margarine in a large saucepan over medium heat. Add onion and sweet potatoes; sauté 5 minutes. Add mustard and remaining ingredients; bring to a boil. Cover, reduce heat, and simmer 20 minutes or until sweet potatoes are very tender. Place sweet potato mixture in a food processor; process until smooth.