Step 1

In a mixing bowl or bowl of an electric mixer, beat butter until smooth and creamy, about 2 min. Add confectioners' sugar ½ cup at a time, mixing well and scraping down sides of bowl occasionally.

Step 2

Beat in vanilla and salt; stir until smooth. Frosting will keep covered in the refrigerator for up to a week. Bring to room temperature and stir before using, if chilled.