Place softened butter in a large mixing bowl.
Beat the butter with an electric mixer on medium speed until creamy.
Gradually add powdered sugar, mixing on low until combined.
Add heavy cream, vanilla extract, and a pinch of salt.
Increase mixer speed to high and beat until fluffy (about 2-3 minutes).
Scrape down the sides of the bowl to ensure everything is mixed well.
For a thinner consistency, add more cream, one tablespoon at a time.
For a thicker frosting, add more powdered sugar as needed.
Taste the frosting and adjust vanilla or salt to your preference.
Use immediately or store in the refrigerator until ready to use.