Mom's Mashed Potatoes a La King

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4 pounds Idaho russet potatoes (about 5 potatoes), peeled and cut into 1-inch pieces

1 pound celery root, peeled and cut into 1/2-inch pieces

Kosher salt

2 sticks butter, 1 softened and 1 melted, plus more for greasing

6 ounces cream cheese

1 cup half-and-half, warmed

1/4 cup prepared horseradish

1 teaspoon garlic powder

1/2 teaspoon ground white pepper

1/4 cup fresh minced chives