Here's a Chocolate Mousse recipe that I came up with for Pesach which is great year-round too. During the year, you can replace the wine with rum.
1 cup chocolate chips
3 tablespoons sweet red wine
3/4 cup sugar, divided
1 16-oz. container heavy whipping cream, divided
Separate the eggs, saving all three whites and just two of the yellows.
Whip the whites into a snow and set aside.
Put the chocolate chips into a heatproof bowl set over a pot of water on the stove. On medium heat, melt the chocolate chips. Add the two eggs yellows, wine, 1/2 cup sugar, and 2 tablespoons of the cream. Stir well and continue heating until the mixture is nice and hot but not boiling. Set aside to cool.
Whip the remaining heavy cream to create whipped cream. Add the remaining 1/4 cup sugar and whip.
Put about half of the whipped cream in a large mixing bowl. Fold in the chocolate mixture and the egg whites.
Use the remaining whipped cream for serving, to top the mousse.