Into a microwave-safe bowl, add
Dark Chocolate (1/2 cup)
. Heat in a microwave oven for 1-2 minutes, stopping every 30 seconds to stir, until completely melted and smooth. Set aside to cool.
Into a large mixing bowl, add
Whipping Cream (1 1/4 cups)
. Using an electric mixer on medium speed, beat for 2 minutes, until mixture forms soft peaks.
Nutella® (3/4 cup)
. Beat to combine.
Drizzle cooled dark chocolate over the top. Use a metal spoon to swirl it around and fold gently together. Don't mix it together completely; you want the swirls of chocolate to show.
Transfer mousse into serving glasses. Garnish with
Chocolate Shavings (to taste)
. Serve immediately, or chill for a couple of hours before serving if you prefer a firmer mousse.