In a medium bowl, beat the softened Challenge Unsalted Butter with a hand mixer until smooth and creamy.
Add the powdered sugar, cocoa powder, vanilla extract, and salt. Beat on low speed until combined, then increase the speed to medium and continue beating until smooth.
Gradually add the heavy cream, one tablespoon at a time, beating until the frosting is light, fluffy, and spreadable. Add more cream if needed for a softer consistency.
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