Heat oil in a medium soup pot, and sauté the onion for 2 minutes. Add all remaining ingredients except the parsley. Mix thoroughly, cover and bring to a boil. Reduce the flame to medium-low and simmer for 20 minutes or until creamy. Serve garnished with parsley.
Per serving - 191 calories, 4 gram fat (18% calories from fat), 8 gram protein, 35 gram carbohydrate, 8 gram fiber, 0 milligram cholesterol, 333 milligram sodium