Wrap each potato in aluminum foil. Bake until tender, about 1 hour. Let cool. Cut each potato in half lengthwise. Scoop out each potato halves, taking care to keep a thin layer of flesh without damaging the skin. In a bowl, mash the potatoes with a potato masher. Refrigerate. Add the egg yolks, one at a time, to the mashed potatoes. Add the butter, cream, 375 ml (1 ½ cups) of cheese, and the nutmeg. Season with salt and pepper. In another bowl with an electric mixer, beat the egg whites until stiff peaks form.
Gently fold into the potato mixture.
With a spoon, fill each potato shell with that mixture. Place the stuffed potatoes on a baking sheet lined with aluminum foil. Sprinkle with the remaining grated cheese. Bake until the potatoes are golden brown, or about 20 minutes. Garnish with fresh parsley.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.