Mix 500 g flour, yeast, 75 g sugar and 1 pinch of salt. Melt 100 g butter. Add milk, let cool lukewarm. Add 1 egg to the flour mixture. Knead everything smooth with the hand mixer. Cover and leave to rise in a warm place for about 30 minutes
Grease a fat pan (approx. 32 x 39 cm; at least 3.5 cm deep) and dust with flour. Wash the plums, remove stalks, halve and stone them. For the icing, mix pudding powder, 50 g sugar, sour cream and 3 eggs
For the crumbles, mix 300 g flour, baking powder, 125 g sugar, vanillin sugar and 1 pinch of salt. Add 1 egg and 175 g butter in pieces. Mix everything first with the dough hooks of the hand mixer, then briefly with your hands to make crumbles
Knead yeast dough briefly. Dust with a little flour, roll out on the fat pan and press up at the edge about 3 cm. Cover and leave to rise for about 15 minutes.
Place the plums close together on the dough like roof tiles. Pour over the mixture. Sprinkle the sprinkles over it. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/gas: level 3) for approx. 45 minutes. Cool down. Sprinkle with sugar crystals