Step 1

Grease an extra large mixing bowl and an 8-inch square non-stick baking pan with butter or baking spray.

Step 2

Pour the Rice Krispies Cereal into the mixing bowl.

Step 3

Break 14 of the Vanilla Wafer cookies into pieces and toss them into the bowl of cereal. Break the remaining 10 cookies into pieces and reserve them for later to sprinkle over the top of the treats.

Step 4

Cut the butter into small pieces and place them in a medium-large saucepan. Set the pan over LOW heat.

Step 5

Let the butter begin to melt, then pour the marshmallows into the pan. Sprinkle the banana pudding mix over top and stir to combine.

Step 6

Stir the marshmallows every few minutes until about 75% of them have melted. Then, remove the pan from the heat and continue to stir until melted. The residual heat will continue to melt the marshmallows without allowing them to get too hot. Do not overheat the marshmallows or your treats will be too hard.

Step 7

Pour the melted banana marshmallows over the cereal and vanilla wafer cookie pieces. Stir until well combined.

Step 8

Spread the banana pudding Rice Krispie treats mixture into the greased pan. Gently press it into an even layer. Do not press too hard or you will compact your treats making them too hard.

Step 9

Immediately, press the remaining cookie pieces onto the top of the treats.

Step 10

Let the treats rest for 30 minutes.

Step 11

Meanwhile, make the vanilla glaze by stirring together the powdered sugar, vanilla, and 1 tablespoon of heavy whipping cream or milk until smooth.

Step 12

If the glaze is too thick, add more heavy whipping cream or milk, 1/2 teaspoon at a time until it is thin enough to drizzle.

Step 13

Cut the treats into 12 rectangles or 16 squares. Drizzle the glaze over the top of the treats. Let the glaze firm up for about 30 minutes before serving.