Start by adding about 1 cup of the vanilla batter to the bottom of the prepared pan. Then alternate with dollops of chocolate batter. Bake in the preheated oven for 20-22 minutes.
In a large bowl, combine cream cheese, room temperature butter, melted unsweetened chocolate, heavy whipping cream, powdered sweetener, vanilla extract, and cocoa powder. Use an electric mixer to whip the ingredients until fluffy and creamy.