Mix the flour, milk and salt into a smooth batter. Stir in the egg yolks, then whisk the egg whites with 1 tbsp sugar until stiff and fold into the mixture.
Heat a little oil in a large frying pan and pour in the batter. Cook until the underside is golden brown, then flip and cover with a lid. Cook until done.
Tear the Schmarren into pieces using two forks, then lightly caramelise with butter, sugar and vanilla sugar. Arrange on warm plates and sprinkle with a little icing sugar.
Serve with homemade cranberry jam.