All you need is a blender to make crazy smooth chocolate mousse.
Place all three chocolate types in the blender along with 1 cup of boiling water. Whiz the chocolate until it's melted and smooth. Add the egg whites and continue to whiz until the mix is smooth and combined, then add cream and vanilla, and whiz again to combine. Pour the mousse into a container and let it chill the fridge for about 4 hours to set.
Serve mousse in individual serving glasses.