Chocolate-Buttermilk Frosting

Why I Love This Recipe
Goes with my Chocolate-Buttermilk Brownies recipe.
Ingredients You'll Need
1/4 cup butter
3 tablespoons cocoa powder
3 tablespoons buttermilk
2 1/4 cups powdered sugar
1/2 teaspoon vanilla
Directions
In a saucepan combine the first 3 ingredients and bring to boiling.
Remove from heat and add powdered sugar and vanilla.
Beat until smooth.
Pour over warm cake.