Make the Crust
Preheat oven to 325°F (160°C).
Mix crushed Nilla wafers, sugar, salt, and melted butter.
Press firmly into the bottom of a 9-inch springform pan.
Bake for 10 minutes, then cool slightly.
Prepare the Cheesecake Filling
Beat cream cheese until smooth and fluffy.
Add sugar and mix until creamy.
Blend in sour cream and vanilla.
Mix in mashed bananas.
Add eggs one at a time, mixing gently after each.
Stir in cornstarch—this keeps the cheesecake stable and prevents excess moisture from the bananas.
Bake the Cheesecake
Pour filling over the crust.
Bake in a water bath for 55–65 minutes, until edges are set but center wobbles slightly.
Turn off oven, crack the door, and cool inside for 1 hour.
Chill
Refrigerate for 6 hours or overnight—this step gives the cheesecake its dense, creamy texture.
Make the Banana Pudding Layer
Whisk instant pudding mix with cold milk until thick.
Fold in whipped cream for a light, fluffy texture—similar to classic banana wafer pudding.
Keep chilled until ready to assemble.