Prepare the Banana Pudding Filling: Mix all pudding ingredients as directed on the package and allow it to thicken. Set aside.
Melt the Butter: In a large saucepan, melt the butter over medium heat.
Combine the Marshmallows: Add 5 cups of mini marshmallows, stirring until they are completely melted and blended with the butter.
Add Flavors: Stir in the vanilla extract and ¼ cup of the banana pudding mixture. Mix well and remove from the heat.
Mix in the Crunch: Fold in the Rice Krispies cereal, the remaining 1 ½ cups of mini marshmallows, and crushed vanilla wafers. Stir until well combined.
Transfer to Baking Dish: Spread the mixture evenly in a parchment-lined baking dish, pressing down lightly to form an even layer.
Top and Drizzle: Drizzle with marshmallow fluff and the remaining banana pudding mixture. Sprinkle with crushed vanilla wafers.
Melt the Chocolate: Melt white chocolate in the microwave in 10-second intervals, stirring until smooth. Drizzle over the top of the treats.
Cool and Serve: Allow the treats to cool and set before cutting into squares.
