Wash the potatoes and cook for about 20 minutes. Wash and stone the plums and fill each with 1 piece of sugar. Quench potatoes, peel them and immediately press them through a potato ricer. Knead with eggs, 1 pinch of salt and 275 g flour until smooth
Form 12 flat cakes from the mixture with well floured hands. Place 1 plum in the middle of each and form the dough into a dumpling. Cook in plenty of boiling water for 18-20 minutes
In the meantime, mix milk and sauce powder in a tall mixing bowl and whip until creamy for approx. 1 minute. Roast breadcrumbs in hot butter until golden brown. Lift out the dumplings, drain well and turn in the breadcrumbs. Serve with vanilla sauce. Dust with icing sugar