This chocolate-hazelnut frosting is the perfect topping for cakes, cupcakes, cookies, and more!
In bowl of stand mixer (or large bowl if using handheld mixer), combine softened butter, Nutella, cocoa, vanilla, and salt. Lock bowl into place and attach paddle to stand mixer, if using.
Start mixer on medium speed and beat until smooth, about 1 minute. Stop mixer. Use rubber spatula to scrape down sides of bowl.
Start mixer on low speed. Slowly add sugar, a little bit at a time, and beat until smooth, about 4 minutes.