Place the whipping cream and powdered sugar in a medium bowl. With an electric mixer beat until stiff peaks form. Taste for sweetness. Frost the cake with the whipped cream.
Sprinkle the 1/4 cup chopped peanut butter and chocolate chips over top of the whipped cream.
Place the peanut butter in a microwave-safe bowl and heat at 10-second intervals, stirring after every 10 minutes. Heat until the peanut butter is a runny consistency about 40 seconds.
Drizzle the heated peanut butter and chocolate topping/syrup over the top of the peanut butter cups and chocolate chips. Refrigerate until ready to serve.