Place 1 in. of water and cauliflower in a large saucepan; bring to a boil over high heat. Cook, covered, until cauliflower is soft, 10-12 minutes. Drain., Mash cauliflower to desired consistency. Stir in 1/2 cup cheese, cream, butter and pepper. Sprinkle with remaining 1/2 cup cheese and, if desired, parsley.