Crust:

1. Preheat your oven to 325°F (163°C).
2. Mix the vanilla wafer crumbs, melted butter, and sugar until well combined.
3. Press the mixture into the bottom of a springform pan.
4. Bake the crust for 10 minutes and then set aside to cool.

Cheesecake Filling:

1. Reduce the oven temperature to 300°F (150°C).
2. In a large bowl, mix the cream cheese, sugar, and flour until smooth.
3. Add the sour cream and banana extract, mixing until well combined.
4. Add the pureed bananas and mix well.
5. Add the eggs one at a time, mixing slowly to avoid incorporating too much air into the batter.
6. Pour the filling into the cooled crust.
7. Place the springform pan inside a larger pan filled with hot water (water bath).
8. Bake for 1 hour and 30 minutes, or until the center is set but still slightly jiggly.
9. Turn off the oven and leave the cheesecake inside for an additional 30 minutes.
10. Remove the cheesecake from the oven and let it cool to room temperature, then refrigerate for at least 4 hours or overnight.

Bavarian Cream:

1. Sprinkle the powdered gelatin over the milk in a small bowl and let it sit for a few minutes.
2. In a separate bowl, whisk the egg yolks together.
3. Heat the heavy whipping cream and sugar in a saucepan over medium heat until warm.
4. Slowly pour a small amount of the warm cream mixture into the egg yolks, whisking constantly to temper the yolks.
5. Pour the tempered yolks back into the saucepan and cook over medium heat, stirring constantly, until the mixture thickens.
6. Remove from heat and stir in the gelatin until fully dissolved.
7. Allow the mixture to cool to room temperature.
8. In a large bowl, whip the cold heavy whipping cream and powdered sugar until stiff peaks form.
9. Gently fold the whipped cream into the cooled custard.
10. Spread the Bavarian cream over the cooled cheesecake.

Whipped Cream Topping:

1. In a large bowl, whip the heavy whipping cream, powdered sugar, and vanilla extract until stiff peaks form.
2. Pipe or spread the whipped cream over the top of the cheesecake.
3. Decorate with fresh sliced bananas before serving.

Additional Information:

Prep Time: 30 minutes
Cook Time: 1 hour 40 minutes
Total Time: 2 hours 10 minutes
Servings: 12-14