Begin by melting the chocolate with one cup of heavy cream over medium-low heat in a large pot. Stir constantly until the chips have melted and then set aside.
In a medium bowl, beat the eggs with the sugar using a hand mixer on medium speed for about 3 minutes.
Continue to mix at medium speed while adding the melted chocolate mixture slowly until combined.
Then pour it all back into the same pan you used to melt the chocolate and heat over medium heat, stirring constantly until thickened.
Remove from heat and cool for about 15 minutes then chill in the refrigerator for at least 2 hours.
After your chill time in the refrigerator, whip the remaining heavy cream using a hand mixer until stiff peaks form. Then fold in the chilled chocolate mixture until completely combined. Your mousse should be fluffy.
Spoon your chocolate mousse into serving dishes and top with a small dollop of whipped cream and a cherry for a pretty dessert.