In standing mixer fitted with whisk attachment, beat butter at medium-high speed until smooth, about 20 seconds. Using paring knife, scrape seeds from vanilla bean into butter and beat mixture at medium-high speed to combine, about 15 seconds. Add confectioners' sugar and salt; beat at medium-low speed until most of sugar is moistened, about 45 seconds. Scrape down bowl and beat at medium speed until mixture is fully combined, about 15 seconds; scrape bowl, add vanilla and heavy cream, and beat at medium speed until incorporated, about 10 seconds, then increase speed to medium-high and beat until light and fluffy, about 4 minutes, scraping down bowl once or twice.
This recipe was submitted by one of our readers and has not been tested by our food editors. We are not responsible for errors in this recipe, but if you find one, please let us know.