1. Microwave the chocolate hazelnut spread for 30 seconds to loosen. Let cool 5 minutes. 2. In a large bowl, using an electric mixer, whip the heavy cream on high speed until soft peaks begin to form, 3-5 minutes. Add the chocolate hazelnut spread, vanilla, espresso powder (if using), and a pinch of salt. Whisk (being careful to not overmix) until smooth, 1 to 2 minutes. Watch closely, if you over whip the chocolate will separate. 3. Divide the mousse among four to six small bowls. Cover with plastic wrap and chill for at least 1 hour, until set, or up to 5 days. Top as desired with whipped cream and chocolate shavings.
Notes
Keep This Mousse Chilled:when left out, the mousse will loosen, so it's important to serve immediately after removing from the fridge.