In a large mixing bowl combine the whipping cream, vanilla, espresso, erythritol, salt, mascarpone and half of the cocoa powder. Mix for 1 minute, scrape down sides of bowl and mix for another minute or until creamy and smooth.
½ cup heavy whipping cream, 1 teaspoon vanilla extract, 1.5 oz espresso, ¼ cup low carb sweetener, ⅛ teaspoon salt, 1 cup mascarpone cheese, 4 tablespoon unsweetened cocoa powder