Based on recipe by Bon Appetit Nov 2006
2 pounds potatoes (I usually estimate 1 potato per person)
1/4 cup (1/2 stick) salted butter
1 cup sour cream
1/4 cup chopped chives
1/4 cup prepared horseradish
salt to season
Follow Perfet Mashed Potatoes recipe but do not add milk and cream from original recipe instead --- Whisk 1 cup sour cream, 1/3 cup chopped chives, and 1/4 cup prepared horseradish in medium bowl. Fold sour cream mixture into potatoes. Season with salt.