
In a large mixing bowl, use an electric mixer to combine the cream cheese and butter and beat until smooth and creamy.
Add lemon zest and salt and beat to combine.
Gradually add powdered sugar while stirring on low speed until completely combined.
Add lemon juice and vanilla extract and stir to combine.
Use to decorate completely cooled cakes and cupcakes. If frosting is too soft to work with, just pop it in the fridge for 15-20 minutes, stir briefly and use.