3. Preheat broiler to high.
4. Using a paring knife, carefully cut a circle in the cut side of potatoes. Using a melon baller or small spoon, remove pulp from potato, leaving a thin shell. Combine pulp, sour cream, 1 tablespoon chives, and next 5 ingredients (through pepper). Evenly fill potato shells with filling; sprinkle with cheese and remaining 1 tablespoon chives.
5. Broil potatoes for 2 minutes or until cheese is lightly browned.