Cheesiest, Richest Mashed Potatoes

INGREDIENTS

1 1/2 lb

russet potatoes ((peeled and cut into 2-inch chunks))

1 1/2 tsp

Kosher Salt

1/4 cup

unsalted butter ((cut into pieces, softened))

4 oz

cream cheese ((softened))

3/4 cup

shredded Parmesan Cheese

1/2 cup

sour cream

1/2 cup

Milk ((warmed))

1/4 tsp

Freshly Ground Black Pepper

Nutmeg