Step 1: Prepare the Crust

1. In a medium bowl, combine the graham cracker crumbs, melted butter, and granulated sugar. Mix until well combined.
2. Press the mixture firmly into the bottom of a 9-inch springform pan to form an even layer. Set aside.

Step 2: Make the Cheesecake Filling

1. In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth and creamy.
2. Gradually add the powdered sugar and vanilla extract, mixing until well combined.
3. Add the mashed bananas and banana pudding mix to the cream cheese mixture. Mix until smooth.
4. Gently fold in the whipped heavy cream until fully incorporated, being careful not to deflate the mixture.

Step 3: Assemble the Cheesecake

1. Pour the cheesecake filling over the prepared crust in the springform pan, spreading it evenly.
2. Cover the pan with plastic wrap and refrigerate for at least 4 hours, or until set.

Step 4: Serve

1. Once set, remove the cheesecake from the refrigerator. Top with sliced bananas and dollops of whipped cream. Optionally, add Nilla wafers for extra crunch.
2. Carefully remove the sides of the springform pan, slice the cheesecake, and serve chilled.