Wash, quarter and stone the plums. Divide the yeast plait into slices. Mix the milk, cream, eggs, 6 tablespoons of sugar and vanilla sugar together well.
Layer the yeast pastries with the plums alternately in a baking dish. Pour the milk and egg mixture over it. Sprinkle with flaked almonds, spread the butter flakes on top and sprinkle with the remaining sugar.
Bake in the oven preheated to 180 ° C for approx. 50 - 60 minutes. If the casserole turns brown, cover with aluminum foil.