Boil the potatoes and eggs, then let them cool.
Peel the potatoes and mash them smoothly.
Separate the boiled eggs into yolks and whites; mash the yolks finely and chop the whites.
Add the egg yolks, heavy cream, salt, and pepper to the mashed potatoes, and mix well.
Whisk the mixture until it becomes a smooth mousse texture.
Place in a bowl and garnish with the chopped egg whites.