Melt the dark chocolate in a double boiler or in the microwave on low power, then let it cool slightly.
Whip the heavy cream until stiff peaks form, being careful not to overwhip, as it will lose its creamy texture.
In another bowl, whip the egg whites until stiff peaks form. Gradually add the sugar and continue to beat until you get a glossy, firm meringue.
Add the vanilla extract and cinnamon to the melted chocolate, then gently fold in the whipped cream.
Finally, gently fold in the meringue, being careful not to deflate the mixture, so that the mousse remains airy.
Divide the mousse into glasses or bowls and refrigerate for at least 2 hours to set and allow the flavors to meld.
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