Cream together the Nutella and the cream cheese until completely combined and smooth.
1 cup Nutella, 4 oz cream cheese
Beat the heavy cream until you have stiff peaks, this will take a couple minutes with an electric mixer on high. Add in the powdered sugar and vanilla. Beat to combine.
1 1/2 cups heavy cream, 1/4 cup powdered sugar, 1/2 teaspoon vanilla extract
Add the whipped cream to the Nutella mixture and fold together until evenly combined.
Divide the mousse between 4 cups. Top with crushed hazelnuts, mini chocolate chips or more whipped cream to serve.