1. Preheat the oven to 325°F (165°C). Lightly grease a 9 inch springform pan and line the bottom with parchment paper.

2. In a medium bowl, combine the graham cracker crumbs, brown sugar, and melted butter until the mixture resembles damp sand and holds together when pressed.

3. Press the crumb mixture firmly into the bottom and slightly up the sides of the prepared pan. Bake the crust for 8 to 10 minutes, until fragrant and just set. Let cool while you prepare the filling.

4. In a large mixing bowl, beat the softened cream cheese until completely smooth and fluffy, scraping down the bowl as needed.

5. Add the granulated sugar and salt and beat until the mixture is silky with no lumps remaining.

6. Mash the ripe bananas until very smooth, then beat them into the cream cheese along with the sour cream, vanilla extract, and ground cinnamon.

7. Add the eggs one at a time, mixing on low speed just until each egg is incorporated. Avoid over mixing so the cheesecake does not crack.

8. Pour about half of the cheesecake batter over the cooled crust and smooth the top. Drizzle several spoonfuls of caramel sauce over the batter and gently swirl with a knife.

9. Pour the remaining batter over the top and smooth again, taking care not to disturb the swirl too much.

10. If using a water bath, wrap the outside of the springform pan tightly with foil and place it in a large roasting pan. Pour hot water into the roasting pan until it reaches halfway up the sides of the springform pan.

11. Bake for 55 to 65 minutes, until the edges are set and the center still has a slight wobble when the pan is gently shaken.

12. Turn off the oven, crack the door open slightly, and let the cheesecake cool inside for 1 hour to help prevent cracks.

13. Remove the cheesecake from the oven and water bath. Run a thin knife around the edge of the pan, then let the cheesecake cool to room temperature.

14. Cover and refrigerate for at least 4 hours, preferably overnight, until completely chilled and set.

15. When ready to serve, release the cheesecake from the springform pan and transfer it to a serving plate. Warm the remaining caramel sauce until pourable but not hot.

16. Pour caramel sauce over the top of the chilled cheesecake, allowing it to drip down the sides.

17. Garnish the center with sliced banana and sprinkle the toasted chopped pecans or walnuts over the top.

18. Slice with a sharp knife, wiping the blade clean between cuts, and serve immediately. Add extra caramel sauce on individual slices if desired.