Mix crushed vanilla wafers and melted butter together. Press firmly into the bottom of a springform pan to make the crust.
In a large bowl, beat cream cheese and powdered sugar until smooth.
In a separate bowl, whisk pudding mix with cold milk until thickened. Fold pudding into cream cheese mixture.
Whip heavy cream with granulated sugar until soft peaks form. Gently fold whipped cream into the cheesecake filling.
Layer banana slices over crust, then spread cheesecake filling on top.
Chill in the refrigerator for at least 4 hours or until firm.
Garnish with more whipped cream and cookies before serving.