In a large mixing bowl, add unsalted butter (¼ cup), cream cheese (4 ounces), vanilla extract (1 teaspoon), and salt (⅛ teaspoon). Use an electric mixer to beat for 20-30 seconds until combined.
Slowly add powdered sugar (1 ½ cups) and beat until combined and smooth (about 30-60 seconds). Slather on warm cinnamon rolls and enjoy!
