Grandma’s Pudding Crumble Cake

First cook the pudding according to the instructions, but only use 600 ml of milk. Let the pudding cool down a bit. Then add sour cream or creme fraiche and stir well. Then make the streusel. Knead the ingredients to make crumbles and finally knead a dash of oil and briefly again. Grease the baking sheet and preheat the oven to 200 degrees. Finally, prepare the oil and quark dough. Mix the quark with the oil, buttermilk, sugar and salt. Add flour and baking powder and knead everything. Possibly add a little more flour. Roll out the dough on a greased tray and prick the bottom with a fork. Brush the dough with pudding. The crumbles are then spread over the pudding and the cake is baked at 200 degrees for about 30-40 minutes. Then drizzle the baked cake with melted butter and add sugar again.