In a medium bowl, add whipping cream, powdered sugar, and peanut butter.
Using the whisk attachment, beat on high speed until stiff peaks form, usually 2-3 minutes.
Spoon 3/4 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.
Place onto your serving tray and refrigerate overnight.