In a medium bowl, whip the 1/2 cup of cream until it holds stiff peaks. Set aside.
In another medium bowl, beat together the cream cheese and peanut butter until smooth and creamy. Add the sweetener and vanilla. If your peanut butter is unsalted, add a pinch of salt as well. Beat until smooth.
If your mixture is overly thick, add about 2 tbsp heavy cream to lighten it and beat until combined.
Gently fold in the whipped cream until no streaks remain. Spoon or pipe into little dessert glasses.
Drizzle with a little low carb chocolate sauce, if desired.