Combine flour, egg yolks, butter, sugar, vanilla sugar, and baking powder - creating a loose and crumbly streusel - the dough does not need to be smoothly kneaded.
375 g wheat flour, 5 egg yolks, 100 g sugar, 30 g vanilla sugar, 1 teaspoon baking powder
Line a baking dish approximately 20/30 cm in size with parchment paper.
Pour 2/3 of the dough into the baking dish and press it firmly into the bottom of the pan.
Pre-bake the dough at 180 degrees Celsius (top/bottom heat mode) for about 15 minutes - until the dough is lightly browned.
Arrange the halved plums on the pre-baked crust - cut side up.
900 g plums
Sprinkle the plums with potato starch and cinnamon.