chocolate buttercream for cupcakes

(makes enough for 30 cupcakes)

ingredients:
- 2 cups (4 sticks) unsalted butter, room temperature
- 12 ounces semisweet chocolate, melted and cooled
- 3 tbsp milk
- 1 1/2 tsp pure vanilla extract
- 5 cups confectioners' sugar

1. In the bowl of an electric mixer fitted with the paddle attachment, beat butter until smooth and creamy, 2 to 3 minutes. 

2. With mixer on low speed, add chocolate until just combined.

3. Add milk, vanilla, and sugar; mix on medium until well combined, being careful not to over mix.