Step 1

In a microwave-safe bowl, combine the chocolate and 1 tablespoon of the butter. Melt in 30 second increments, stirring in between until smooth. Alternatively, you can melt the chocolate and butter together in a heat-proof bowl set over a pan of barely simmering water. Set aside to cool to lukewarm.

Step 2

In a large bowl, beat the remaining 1/2 cup butter and the cream cheese together until smooth. Beat in the powdered sweetener and the cocoa powder until well combined.

Step 3

Add the chocolate and vanilla extract and beat until smooth. The mixture will be very thick at this point.

Step 4

Add the cream a few tablespoons at a time until a spreadable consistency is achieved.