Step 1

In the bowl of a stand mixer fitted with a paddle attachment or in a large mixing bowl with an electric hand mixer, cream the unsalted butter and cream cheese for about 5 minutes until it is smooth and creamy.

Step 2

Add in the powdered sugar and mix on low speed until it is fully combined with the butter. Then, add in the melted and cooled semisweet chocolate, dark cocoa powder, vanilla extract and salt and mix well. Scrape the sides and bottom of the bowl to ensure all of the ingredients are well combined.

Step 3

Turn the mixer speed to medium and whip the frosting for 2 to 3 minutes until it is smooth and creamy. Then, mix the frosting on low speed for several minutes to remove any air bubbles.