01 - Preheat oven to 350°F. Grease a 9x13-inch baking dish thoroughly.
02 - Beat cream cheese with sugar until smooth. Add egg and vanilla extract, mixing until fully combined and creamy. Spread evenly across the bottom of the prepared baking dish.
03 - Arrange sliced bananas evenly over the cheesecake layer in a single layer.
04 - Whisk together banana pudding mix and cold milk for 2 minutes until thickened. Pour over the banana layer and spread gently to cover.
05 - Sprinkle crushed vanilla wafers evenly over the pudding layer.
06 - Evenly sprinkle the dry yellow cake mix over the top without mixing.
07 - Drizzle melted butter over the cake mix, covering as much surface area as possible.
08 - Bake for 45-50 minutes, until the top is golden brown and the center is mostly set. Cool for at least 30 minutes before serving.
09 - While cake cools, whip heavy cream with powdered sugar and vanilla extract until soft peaks form.
10 - Serve warm or chilled, topped with whipped cream. Garnish with additional banana slices and vanilla wafers if desired.