In a large mixing bowl, beat the softened butter until creamy.
Gradually add powdered sugar and cocoa powder, mixing on low speed.
Scrape down the sides of the bowl to ensure even mixing.
Add vanilla extract and a pinch of salt.
Pour in heavy cream and beat on medium speed for 2-3 minutes until fluffy.
Adjust consistency by adding more cream if needed.
Taste and add more cocoa or sugar if desired.
Beat for an additional minute for extra fluffiness.
Use immediately or store in an airtight container.