We've intensified the chocolate flavor to make dark chocolate frosting! This buttercream recipe is an amazing way to finish your layered cake or peanut butter cupcakes.
In a large bowl, beat the butter and shortening with an electric mixer on medium speed until combined. Add dark cocoa powder or melted chocolate and vanilla.
Gradually add powdered sugar, one cup at a time, beating well on medium speed. Scrape sides and bottom of bowl often. When all sugar has been mixed in, frosting will appear dry.
Add milk and beat at medium speed until light and fluffy. If frosting is too stiff, add additional milk, 1 teaspoon at a time, until frosting reaches desired consistency.
Keep frosting covered with a damp cloth until ready to use.