Knead butter, 150 g flour and 75 g sugar first with the dough hooks of the hand mixer, then with your hands to crumbles. Put the crumbles in a cool place. Put 300 g flour, baking powder, 75 g sugar, salt and vanillin sugar into a mixing bowl and mix.
Add the quark, 6 tbsp. milk, egg and oil, knead to a smooth dough with the dough hooks of the hand mixer. Divide into 10 pieces of equal size. Form into 10 balls with floured hands. Press the balls flat or roll them out a little (approx. 4 mm thin) and place them next to each other, slightly offset, on 2 baking trays lined with baking paper.
Mix sour cream, sauce powder, 30 g sugar and poppy seed mixture. Spread the mixture on the dough circles, leaving 0.5-1 cm of edge free. Wash apples, grate dry and cut out the core. Cut or slice the apples into very thin slices and place them on the poppy seed mixture.
Spread the crumbles evenly on the talers. Bake the trays one after the other in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 18-20 minutes. Remove from the oven and allow to cool on a cake rack.