Run an inch of water into the bottom of a large saucepan, then add the cauliflower florets. Bring the water to a boil over high heat, then turn it down and simmer the cauliflower for 10 to 12 minutes, or until soft. Drain the cauliflower well.
Mash the cauliflower until it reaches your desired consistency (some cooks prefer their mashed cauliflower slightly chunky, while others prefer a smooth texture). Stir in ½ cup of the Parmesan, plus the cream, butter and pepper. Transfer the cauliflower to a serving bowl, and garnish with the remaining Parmesan and the parsley, if you’re using it.
