In the bowl of your stand mixer or a large bowl (to use a hand mixer), beat the heavy cream until it becomes whipped cream with stiff peaks. Use a spatula and move the whipped cream to another bowl and set aside. In the same mixing bowl of your stand mixer (or hand mixer), put in the cream cheese and peanut butter and mix until light and well blended. Add the confectioners sugar and on LOW, begin mixing it into the cream cheese and peanut butter. Gradually increase the speed (if you start off on medium or high you'll end up with a powdered sugar snowstorm in your kitchen, and you'll be pissed). Add vanilla and mix until totally incorporated. Add back in the whipped cream and mix until totally combined.