For the dumplings made from beaten egg whites with egg liqueur cream, separate the eggs. Beat the beaten egg whites together with the powdered sugar until stiff. Heat water in a pot. Form dumplings from the very stiff beaten egg whites and cook in boiling water.
Dissolve the cornflour in a little cold milk by stirring. Boil the rest of the milk with whipped cream, sugar, one pkg. vanilla sugar and salt.
Stir in the cornflour-milk mixture and bring to the boil again. Remove from heat and add yolks, stirring constantly. Stir in eggnog and vanilla sugar to taste.
Arrange cream in a cup or soup plate and place gnocchi of beaten egg whites on top.