Beat eggs, sugar, salt and vanilla sugar until lightly frothy and stir in yogurt. Mix flour with baking powder and fold in. Spread on a greased baking sheet and smooth out. Wash the plums, cut in half and remove the stone. Spread them side by side on the dough.
Process the ingredients for the sprinkles into sprinkles and spread over them.
Bake in the preheated oven at about 180 ° for about 45 minutes.