Cream together butter, cream cheese, salt, and vanilla until smooth and fluffy.
Beat in powdered sugar, 1 cup at a time, until a thick, creamy frosting comes together and all the powdered sugar is dissolved.
Use as desired! Store at room temperature up to 8 hours, in the fridge up to 3 days or in the freezer up to 1 month.
Notes
Times and Nutritional Values are a best estimate based upon personal equipment and products. They may vary based upon the products and equipment available to you.