Mixer I've made this with both a stand mixer and a handheld mixer, both work just fine.
Ingredients
1poundsalted buttersoftened
1 cupcocoa powder
8cupspowdered sugar
1/4cupwatermay not need whole amount of water
1teaspoonvanilla extract or coffee extractoptional
Instructions
In a large bowl, beat softened butter until smooth and fluffy. If using a stand mixer, use paddle attachment and beat butter on medium high speed.
Turn down speed to low, slowly add in powdered sugar and cocoa powder. If mixture is getting too thick, add in water one tablespoon at a time until desired consistency is reached. I typically add in a couple tablespoons of water immediately when adding in the cocoa powder so it doesn't poof in my face. I then add more as needed to reach desired consistency.