Mix softened butter on medium speed with an electric or stand mixer. Beat for 30 seconds until smooth and creamy.
Add powdered sugar, heavy whipping cream, and vanilla extract. Increase to high-speed and beat for 3 minutes. Add more cream if needed for spreading consistency.
Frost the desserts using a piping bag or knife.
Notes
I highly recommend using heavy whipping cream because it will give the frosting a thicker texture but you may use milk.
This yields 3-4 cups depending on how it whips up.