1/2 cup unsalted butter, softened
2/3 cup unsweetened cocoa powder
3 cups powdered sugar
1/3 cup milk
1 teaspoon vanilla extract
Pinch of salt
Beat the butter until smooth
Mix in the cocoa powder
Add the powdered sugar gradually
Pour in the milk a little at a time
Add the vanilla extract
Add the salt
Beat until smooth and fluffy
Add more milk if too thick
Add more powdered sugar if too thin