Defrost the blueberries. Pour milk into a high mixing bowl. Stir in sauce powder with a whisk and continue stirring vigorously for about 1 minute.
Stir yoghurt, 4 tablespoons sugar and vanillin sugar until smooth. Whip cream until stiff and fold in. Mix half blueberries and 4 tbsp. sugar. Purée the rest of the blueberries. Cut cream in half. Stir the blueberry puree into one half.
Divide the sugared blueberries, except for 2 tablespoons, between 4 dessert glasses. First layer the blueberry cream, then the light cream. Stir the vanilla sauce once more and distribute into the glasses. Add the rest of the blueberries.
Decorate with mint.