Sort and rinse the blueberries. Mix half of the berries and 3 tablespoons of sugar. Pour milk and sauce powder into a high mixing bowl, whisk at highest speed for approx. 1 minute
Mix soured milk, 3 tablespoons sugar and vanillin sugar. Whip cream until stiff and fold into the soured milk. Puree remaining blueberries and stir into 2/3 of the soured milk cream
Sugared blueberries, except for a few, in 4 glasses. First spread blueberry cream, then the remaining sour milk cream on top. Stir the vanilla sauce again and pour over the top. Decorate with remaining blueberries