Prepare the Graham Cracker Crust: Combine graham cracker crumbs, melted butter, and sugar. Press into a 9×13 inch baking pan. Bake at 350°F (175°C) for 8-10 minutes. Let cool.
Make the Cheesecake Filling: Beat cream cheese and sugar until smooth. Add eggs, vanilla extract, and banana extract. Fold in mashed bananas. Pour over crust.
Bake the Cheesecake Bars: Bake at 350°F (175°C) for 25-30 minutes. Turn off oven and cool with door ajar for an hour. Refrigerate for at least 4 hours.
Prepare the Banana Pudding Topping: Whisk pudding mix and milk. Let thicken. Fold in whipped cream. Spread over chilled cheesecake.
Garnish and Serve: Arrange banana slices and vanilla wafers on top. Cut into squares and serve cold.
