In a large bowl, beat together softened butter and cocoa powder until well combined.
Gradually add powdered sugar, one cup at a time, beating well.
Mix in heavy cream and vanilla extract. Beat until fluffy.
Adjust the thickness by adding more powdered sugar or cream if necessary.
Use immediately or store in the refrigerator.
Notes
Ensure butter is at room temperature for smoother frosting.
• Sift powdered sugar and cocoa to prevent lumps.
• Adjust the consistency with more cream or powdered sugar if needed.
• Store in a cool place to maintain texture.
• Can be made ahead and refrigerated; just bring to room temperature before using.