Melt the white chocolate in a water bath and let it cool down a little. In the meantime, whip the cream until stiff. Gradually fold in the cool, liquid chocolate. Finally fold in the yogurt.
Pour the mousse into small glasses (number depending on the filling level), alternating with pieces of biscuit, coarsely chopped white chocolate or coconut flakes or leave pure.
Let the dessert cool well in the refrigerator for a few hours or up to a day. Garnish the mousse with toasted coconut flakes if you like before serving.