Melt the butter in a small pot and let it cool down. Mix 200 g flour, 100 g sugar, 1 pinch of baking powder and 1 pinch of salt. Add 1 egg. Add the butter and knead into crumbles using the dough hooks of the hand mixer.
Mix milk, oil, 1 egg, quark, 1 pinch of salt and 60 g sugar. Mix 200 g flour and the rest of the baking powder and sieve it onto the quark cream. Knead to a smooth dough with the dough hooks of the hand mixer.
Roll out the dough on a floured work surface to an oval flat cake (approx. 15 x 35 cm). Place diagonally on a baking tray lined with baking paper. Mix crème fraîche with vanillin sugar, 50 g sugar and 1 egg, spread on top.
Spread crumbles on top and sprinkle with almond flakes. Bake in the preheated oven (electric range: 200 °C/ convection oven: 175 °C/ gas: level 3) on the middle shelf for 20-25 minutes. Let them cool down.
Sprinkle with granulated sugar and dust with icing sugar. Decorate with mint.