This is the best chocolate frosting I have ever had. I got it from one of my favorite cook books, Chocolate From the Cake Mix Doctor. It makes enough to frost a 2 or 3 layer cake, or a bunch of cupcakes and some to eat with a spoon
8 T (1 stick) butter, cut into pieces, and melted in the micro
2/3 C unsweetened cocoa powder
3 C powdered sugar
1/3 C sour cream
1 t vanilla extract
Place melted butter in large mixing bowl. Add cocoa and whisk until smooth. Add powdered sugar and sour cream, continuously whisking or blending. Add vanilla. Beat until fluffy.