Pour the frozen raspberries into the glasses or bowl as the first layer.
Drain the canned peaches and cut them into small pieces or slices.
Spread the peaches over the raspberries as the second layer.
Beat the sweet cream with the vanilla sugar until stiff peaks form, about 3-5 minutes.
Fold in the sour cream and season to taste with sugar.
Pour the cream mixture into the glasses or bowl as the final layer.
Refrigerate for at least 4 hours before serving.
Optional: For a caramelized sugar topping, skip mixing sugar into the cream. Layer the unsweetened cream and sprinkle sugar over the top instead, then refrigerate for at least 4 hours.