Place a layer of cookies in the bottom of a medium sized mixing bowl.
Slice a banana over the top. Repeat two more times with another layer of wafers and remaining bananas. In sauce pot (or double boiler) on medium low heat, add all ingredients except for vanilla. Stir well with wire whisk. Allow to cook, stirring constantly to prevent scorching, until thickened – about fifteen minutes. Add in vanilla and stir. Immediately pour over wafers and bananas.
Let sit in the fridge for about 2 hours until cool, allowing wafers time to absorb pudding.
Finally, crush about 7 or 8 cookies and top with cookie breadcrumbs and one slice of banana.