Chive Mashed Potatoes

3 lbs russet potatoes, peeled and cubed
3/4 cups milk
1/4 cup butter
2 Tbsp prepared horseradish, drained
2 Tbsp chopped chives

Cook potatoes until fork-tender. Drain and return to pot. In a sauce pan, over medium-low heat, warm next 3 ingredients for 3 minutes.  Mash potatoes with milk mixture. Stir in chopped chives.