In the bowl of your electric mixer, add the whipping cream, powdered sugar and peanut butter. Using the whisk attachment, beat on high speed until stiff peaks form, usually 2-3 minutes.
Spoon ¾ of a teaspoon of whipping cream on a cookie, press another cookie on top and continue until your cakes are 5 cookies tall.
Garnish top of cake with a dollop of cream and peanut butter cup candy if desired.