Add brown sugar, salt, powdered sugar milk and vanilla. Whip until smooth and sugar has dissolved.
Notes
Soften your butter before making the icing, it will combine much easier. Softened, room temperature butter is required for frosting recipes - learn how to soften butter quickly!
If you use salted butter, reduce the amount of added salt in the recipe or omit altogether.
Use frosting at room temperature. If you have made it ahead of time, take it out of the fridge 30 minutes before using it.
It’s quickest and easiest to make caramel icing with a stand mixer, but you can mix it by hand, just ensure that everything is well combined.