Cook a pudding from milk, pudding powder and sugar and let it cool. Knead the flour with 125 g butter, 70 g sugar, the egg, the baking powder and the vanilla sugar quickly and make a shortcrust pastry. Wrap in foil and let rest for 30 minutes.
Drain the sour cherries. Grease the bottom of a springform pan and place the rolled-out shortcrust pastry on top. Pull up one edge. Scatter the breadcrumbs on the floor, then the cherries and top the pudding on the floor.
Preheat the oven to 180 ° C.
Melt the remaining butter and stir in the remaining sugar, cream and almond slivers. Pour the mixture on the cake and bake in the oven for about 50 minutes.