Preheat oven to 325°F (163°C). Line a 9-inch (23cm) springform pan with parchment paper in the bottom and grease the sides.

Combine the crust ingredients in a small bowl. Press the mixture into the bottom and up the sides of the springform pan.

Bake the crust for 10 minutes, then set aside to cool.

Cover the outsides of the pan with aluminum foil so that water from the water bath cannot get in. Set prepared pan aside.

Reduce oven temperature to 300°F (148°C).

In a large bowl, beat the cream cheese, sugar and flour on low speed until well completely combined and smooth. Scrape down the sides of the bowl.

Add the sour cream and banana extract and mix on low speed until well combined.

Add the pureed bananas and mix on low speed until combined.

Add the eggs one at a time, mixing slowly to combine after each addition. Scrape down the sides of the bowl as needed.

Pour the cheesecake batter into the crust.

Place the springform pan inside another larger pan. Fill the outside pan with enough warm water to go about halfway up the sides of the springform pan.

Bake for 1 hour 30 minutes. The center should be set, but still jiggly.

Turn off the oven and leave the door closed for 30 minutes.

Crack the door of the oven for 30 minutes to allow the cheesecake to continue to cool slowly.

While the cheesecake finishes cooling, make the bavarian cream. In a small bowl, sprinkle the gelatin onto the milk and set aside.

In a medium bowl, whisk the egg yolks together and set aside.

Add the ½ cup of heavy cream, sugar, vanilla extract and banana extract to a large saucepan and heat over medium heat until warm.

Remove the cream mixture from heat and slowly pour the hot cream into the eggs to temper them.

Add the egg and cream mixture back into the saucepan and return to the heat. Continue cooking over medium heat until thick enough to coat the back of a spoon.

Add the gelatin mixture to the hot cream and stir until smooth.

Pour the custard into another bowl and set that bowl inside another bowl over ice. Allow to cool to room temperature.

While the custard cools, add the ⅔ cup of heavy whipping cream and powdered sugar to a large mixer bowl and whisk on high speed until stiff peaks form.

When the custard is ready, gently fold the whipped cream into the custard.

Remove the water bath wrapping from the cheesecake and spread the bavarian cream evenly over the top. Refrigerate until completely cool and firm, 5-6 hours.

When the cheesecake is cool and firm, remove it from the springform pan.

Add the heavy whipping cream, powdered sugar and vanilla extract for the whipped cream topping to a large mixer bowl and whisk on high speed until stiff peaks form.

Pipe swirls of whipped cream around the edge of the cheesecake, then serve with sliced bananas.