In a medium sauce pan over medium heat, COOK potatoes in broth until softened, about 15 minutes; PUREE.
Return puree to sauce pan; ADD milk, STIRRING, until consistency of a thick soup.
STIR in butter and chives; bring to SIMMER; REMOVE from heat.
ADD sour cream, salt and pepper.
Serve with additional sour cream
Per Serving (excluding unknown items): 282 Calories; 11g Fat (34.7% calories from fat); 11g Protein; 35g Carbohydrate; 3g Dietary Fiber; 26mg Cholesterol; 844mg Sodium. Exchanges: 2 Grain(Starch); 1/2 Lean Meat; 0 Vegetable; 1/2 Non-Fat Milk; 2 Fat.