Make a shortcrust pastry from flour, baking powder, sugar, egg yolk, milk and butter. Line a greased baking pan (26 cm) with it and prick it several times with a fork. Pre-bake in a preheated oven at 180 ° C top / bottom heat for approx. 10 minutes.
In the meantime, whip the cream until stiff for the filling and pour in the sugar and a pinch of salt. Carefully stir in the egg yolks, also the vanilla pudding powder with the low-fat quark. Finally fold in the egg whites.
Spread on the pre-baked shortcrust pastry and bake for about 1 hour at 175 ° C.