Chocolate Frosting:
Heat 1/3 cup butter, 2 ounces unsweetened baking chocolate and 2 Tablespoons milk until just melted.
Stir in 2 cups powdered sugar and 1 teaspoon vanilla.
Beat until smooth, adding a very small amount of milk for spreading consistency.
Frost cupcakes immediately, adding a little more milk if the frosting gets too stiff.