3ouncesunsweetened chocolateor 2/3 cup cocoa powder and 3 tablespoons oil*
1cupbutter, softened(2 sticks)
Melt chocolate in a 2-cup measure or small bowl until smooth (or simply whisk cocoa powder and oil until combined, if using).
In the bowl of an electric mixer, combine the butter with the vanilla and chocolate mixture with the whisk attachment.
Add the powdered sugar and milk and whisk for about a minute, scraping sides as needed to make sure all the ingredients are mixed together.
Set the speed to the highest and whisk for 2-4 minutes - until the frosting is light and fluffy and turns a lighter in color (this incorporates air and sets it apart from regular frostings).
*I've used mild olive oil, sunflower, and walnut oil all to good results. Try coconut oil at your own risk, since it hardens in coolness or liquifies when hot, I can't vouch for how it will turn out.Makes enough to frost a two-layer cake or 12 cupcakes.