Knead flour, baking powder, 100 g sugar, salt, vanillin sugar, fat in pieces and 1 egg first with the dough hooks of the hand mixer and then with your hands until smooth. Cover and chill for about 30 minutes.
Wash, stalk and stone the cherries. Drain the apricots and cut into slices. Mix quark, 75 g sugar, 4 eggs and sauce powder
Roll out the shortcrust pastry on a little flour and make it round (approx. 30 cm Ø). Place in a greased spring or tart tin with removable base (26 cm Ø). Press down slightly at the edge. Prick the base several times and sprinkle with breadcrumbs
Spread cherries and apricots on top. Pour over it. Bake in the preheated oven on the lowest level (electric oven: 175 °C / convection oven: 150 °C / gas: level 2) for approx. 50 minutes. Let them cool down
Remove the tart from the mould. Sprinkle with sugar crystals. Serve with crème fraîche