For the Schmarren, put milk, butter, sugar and vanilla sugar in a saucepan and bring to the boil. Stir in the polenta, reduce a little briefly and then let it cool down.
Mix the egg yolks and quark together and stir in the polenta porridge, spoon by spoon. Beat the egg white until stiff and fold in with the flour.
Heat some oil or butter in a pan. Pour in the dough and bake on the stove until golden. Divide into 4 parts with a spatula. Turn these over and bake on the other side until golden. Then cut into bite-sized pieces.
Distribute on plates, dust with a little icing sugar and serve with the plum-apple sauce.