In a mixing bowl, pour in the milk then whisk in the package of banana pudding. Place in the refrigerator for 15-20 minutes to set.
While waiting, crush the vanilla wafers in a food processor. Then, mix in melted butter into the crumbs. Now, in the springform pan, form the crust with the buttery crumbs.
After the time is up, remove the bowl from the fridge, then using a hand mixer, mix in the sour cream and powdered sugar into the pudding. Add in the vanilla next and lastly the cream cheese. Be sure to scrape the sides and the bottom to make sure everything is mixed evenly.
Pour the cheesecake batter over the crust in the pan. Smooth out the top then cover for 8-12 hours to allow the cheesecake to fully set.
Right before serving, you can decorate the no bake banana pudding cheesecake with cookie crumbs, bananas, whip cream or enjoy it however you'd like.