For the dough, mix flour, baking powder, 125 g sugar, vanillin sugar and salt in a mixing bowl. Add milk, oil, egg and quark and knead with the dough hooks of the hand mixer to a smooth dough.
Roll out the dough on a greased baking tray (32 x 39 cm), press the corners with floured hands. Press many hollows into the cake with your fingers. Spread butter in flakes. Sprinkle evenly with flaked almonds and 100 g sugar.
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 20 minutes. Remove from the oven and let cool on a cake rack. Tastes very good even when lukewarm. Whipped cream tastes good with it.