In a large bowl, whisk together the instant pudding mix and the whole mix. Stir for about two minutes or until thoroughly dissolved and combined. Cover with plastic wrap and chill in the fridge for at least half an hour or up to 3 hours.
In a separate bowl, whip the heavy cream until frothy and somewhat thick. Stir in the powdered sugar, peanut butter and vanilla. Continue to beat until soft peaks form, being careful to not over-mix.
To assemble the pudding, use either one large trifle dish or four mini trifle dishes. Begin with a layer of cookies, then pudding, banana slices and peanut butter whipped cream. Repeat the layers until all of the dishes are filled. Garnish with a cookie on top. Cover with plastic wrap and chill for at least half an hour. Serve chilled. Enjoy!