In a Double Boiler, melt the chocolate. Set aside to cool.
In a stand mixer, beat the Heavy Cream, Vanilla, and Salt until thoroughly whipped and stiff.
Separate eggs, keeping yolks for another use.
Add egg whites to a separate, large bowl. Beat the egg whites until stiff peaks form.
Add sugar a bit at a time, beating well with each addition.
Once all sugar is added, beat until well blended and the mixture holds stiff peaks.
Add cooled, melted chocolate to egg white/sugar mixture. Gently fold until evenly mixed in.
Now, add whipped heavy cream to the chocolate mixture. Gently fold in until evenly mixed in. Take care to fold gently, trying to keep the airy texture of the mousse.
Spoon into 6 separate serving vessels - ramekins, bowls, glasses, etc.
Cover and chill at least 4 hours, or overnight.