Please someone give me a good chocolate buttercream recipe. I have to cover a full sheet in black icing, and just need it to go on really smooth! Thanks!

A quality cocoa powder (such as Ghirardelli) can be added to your standard buttercream to make it chocolate but I prefer to add cooled melted chocolate instead after the frosting texture has lightened up and it's just about ready to stop being mixed.

Or you can make chocolate ganache separately and beat them together -- delish!