Make the Nilla Wafer Crust:

1. Preheat your oven to 325°F (163°C). Spray a 9-inch springform pan with nonstick spray and line the bottom with parchment paper.
2. Process the Nilla Wafers in a food processor until fine crumbs form. Mix in the brown sugar and melted butter until evenly combined.
3. Press the crumb mixture into the bottom and halfway up the sides of the prepared pan. Use the bottom of a measuring cup to compact the crust.
4. Bake for 11 minutes. Remove from the oven and let cool.

2. Prepare the Banana Cheesecake Filling:

1. In a large mixing bowl, beat the cream cheese and granulated sugar on high speed for 2 minutes until light and fluffy. Scrape down the sides as needed.
2. Add the mashed bananas, vanilla extract, sour cream, and heavy cream. Mix on medium speed until combined.
3. On low speed, add the eggs one at a time, mixing until just incorporated. Avoid overmixing.
4. Pour half of the cheesecake batter over the cooled crust. Layer with sliced bananas and sprinkle crushed Nilla Wafers on top. Pour the remaining batter over the layers.

3. Bake the Cheesecake:

1. Place the springform pan into a larger baking dish. Pour hot water into the dish until it reaches halfway up the sides of the pan to create a water bath.
2. Bake for 80-90 minutes, or until the edges are set and the center has a slight jiggle.
3. Turn off the oven, crack the door slightly, and let the cheesecake cool for 30 minutes. Remove from the water bath and cool completely on a wire rack.
4. Cover the cooled cheesecake with foil and refrigerate for at least 6 hours or overnight.

4. Make the Whipped Vanilla Pudding Topping:

1. In a bowl, whisk the vanilla pudding mix and cold milk until smooth. Refrigerate for 5 minutes to set.
2. In a separate chilled bowl, whip the heavy cream and vanilla extract on high speed until stiff peaks form.
3. Gently fold the whipped cream into the pudding mixture until fully combined.

5. Assemble the Cheesecake:

1. Remove the cheesecake from the springform pan and transfer to a serving plate.
2. Spread the whipped vanilla pudding topping evenly over the top of the cheesecake.
3. Garnish with crushed Nilla Wafers and additional banana slices if desired.