1/4cupwhipping creampossibly more or less depending on desired consistency
Instructions
If using a stand mixer, fit with paddle attachment.
Beat butter on high speed until smooth and creamy.
Add in vanilla and beat until smooth.
Turn mixer to slow speed. Slowly add in powdered sugar and beat until all incorporated.
Add in whipping cream 1 tablespoon at a time until desired consistency is achieved. To pipe, I like a fairly stiff consistency, meaning that my spatula, when stuck in the icing, stands up and does not list.