Prepare the Crust: Preheat the oven to 325°F (165°C). In a medium bowl, combine the crushed vanilla wafers and melted butter. Press the mixture firmly into the bottom of a 9×9-inch baking dish. Bake for 10 minutes, then remove from the oven and set aside.

Make the Cheesecake Filling: In a large bowl, beat the cream cheese and sugar together until smooth and creamy. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract and mashed bananas. Pour the filling over the prepared crust.

Bake for 25-30 minutes, or until the center is set and the edges are lightly browned. Remove from the oven and let cool to room temperature.

Prepare the Banana Pudding Layer: In a medium bowl, whisk together the banana pudding mix and cold milk until smooth. Fold in the whipped cream. Spread the pudding mixture over the cooled cheesecake layer.

Add the Topping: Spread the whipped cream over the banana pudding layer. Garnish with sliced bananas and vanilla wafers.

Refrigerate for at least 4 hours, or overnight, before serving.

Cut into squares and serve chilled.