Total Time
10 minutes
Servings
Enough for 1 cake
1 cups (2 sticks) butter, softened
3½ cups confectioner's sugar (possibly a little more)
½ cup unsweetened cocoa powder
1 teaspoon vanilla
½ cup very strong brewed coffee
Combine butter, confectioner's sugar, cocoa, vanilla, and coffee in a medium-large bowl, mixing slowly until everything is moistened.
Beat at high speed with an electric mixer until uniform and fluffy.
If it seems a little too wet to spread, you can beat in up to ½ cup additional confectioner's sugar.