Prepare the Crust: In a medium bowl, combine Nilla Wafer cookie crumbs with melted butter until fully moistened. Press this mixture into the bottom of an 8x8-inch baking pan lined with parchment paper. Chill in the refrigerator for at least 30 minutes.

Make the Filling: In a large mixing bowl, whip heavy whipping cream and sugar together using an electric mixer until stiff peaks form, about 3-5 minutes. In a separate bowl, beat softened cream cheese until smooth. Gradually stir in instant banana cream pudding mix.

Combine Mixtures: Gently fold the whipped cream into the cream cheese mixture using a spatula until fully combined.

Assemble the Bars: Spread the cheesecake filling evenly over the chilled crust. Cover with plastic wrap and refrigerate for at least 8 hours.

Serve and Enjoy: Cut into squares and garnish with whipped topping and banana slices. Serve chilled.