Place the softened butter in the bowl of a stand mixer fitted with a paddle attachment.

Beat the butter on medium-high speed for 2 minutes until pale and creamy.

Reduce speed to low and gradually add the powdered sugar, cocoa powder, heavy cream, vanilla, and salt.

Once the sugar is incorporated, increase the speed to high and beat for 2 minutes until the frosting is light and fluffy.

Scrape down the sides of the bowl as needed to ensure complete homogenization.