Preheat the oven to 325°F. In a medium bowl, combine graham cracker crumbs and melted butter. Press mixture into the bottom of a 9-inch springform pan to form the crust.
In a large mixing bowl, beat the cream cheese and sugar until smooth and creamy.
Add eggs one at a time, mixing well after each addition.
Stir in mashed bananas, lemon juice, vanilla extract, and sour cream until fully incorporated.
Pour the batter over the prepared crust in the springform pan and smooth the top.
Bake for 60 minutes or until the center is almost set but still slightly jiggly.
Turn off the oven and leave the cheesecake inside with the door closed for 1 hour.
Remove from oven and cool completely. Refrigerate for at least 4 hours before serving.
Notes
For an extra touch, drizzle with chocolate syrup and garnish with chopped nuts and sliced bananas before serving.