Step 1

Warm 1/2 cup cream and use it to melt the chocolate. Heat 1/2 cup of the cream in a microwave-safe bowl for 1 minute. Add 1 cup chocolate chips and stir to combine. Set the bowl aside for 5 minutes for the chocolate to melt.

Step 2

Whisk the chocolate and cream together. Whisk the chocolate and cream together until smooth. Set aside to cool while you whip the remaining cream.

Step 3

Beat the remaining cream to medium peaks. Place the remaining 1 cup cold cream in a medium bowl. Beat with an electric hand mixer or with a whisk by hand until soft peaks form. Transfer 1/2 cup to a small bowl and refrigerate for topping the finished mousse before serving. Continue whipping the remaining whipped cream until stiff peaks form.

Step 4

Fold the whipped cream into the chocolate in three additions. Fold the whipped cream into the cooled chocolate mixture with a large spatula in three additions. Work swiftly and gently and don’t stress if there are streaks of cream in the chocolate mousse.

Step 5

Portion the mousse and chill before serving. Divide the mixture between 4 ramekins or cocktail glasses. Refrigerate at least 1 hour and up to 4 before serving. Dollop with the reserved softly whipped cream and sprinkle with grated chocolate or chopped hazelnuts, if desired.