1/8 tsp. pepper
1/4 tsp. garlic powder
3/4 tsp. salt
1/4 cup freshly chopped chives
1/2 cup sour cream
1/2 cup finely grated fresh Parmesan cheese (2 oz.)
4 tbsp. butter, cubed
1/4 cup milk
1/2 cup heavy cream
3 lbs. russet potatoes peeled and cut into 1 1/2-inch chunks