I can only say two words when I've tried this buttercream frosting. PURE PERFECTION. :)
Fluffy Nutella Buttercream Frosting
Source: Kitchen Treaty
1 cup of unsalted butter
2 cups of powdered sugar/icing sugar
2/3 cup of Nutella
1 tsp of pure vanilla extract
pinch of kosher salt (up to 1/4 tsp, to taste)
2 tbsp of heavy whipping cream
1. In a stand mixer affixed with paddle attachment, beat together butter and powdered sugar until well blended. Add Nutella and increase the speed to medium. Beat for 2 minutes.
2. Add vanilla extract and salt and whip for an additional 30 seconds.
3. Add whipping cream and beat for about 1 minute until the frosting lightens slightly in both color and texture.