In a medium bowl, combine 2 (3.4 ounce) boxes instant banana cream pudding mix, 1 (8 ounce) tub whipped topping, and 3 cups whole milk. Stir until smooth and fully blended, with a pale yellow color and no streaks remaining. Set aside.
Arrange a single layer of graham cracker squares across the bottom of a 9x13-inch baking dish. Spread half of the pudding mixture evenly over the graham crackers, then top with one sliced banana.
Add another layer of graham crackers, followed by the remaining pudding mixture, and top with the second sliced banana. Finish with one final layer of graham crackers.
Spread 2 cups whipped topping evenly over the top. Cover and refrigerate for at least 4 hours (overnight is best) until the layers are set (they should get soft). Just before serving, top with the remaining sliced banana and enjoy.
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.
You will need more than just 1 of the small tubs of whipped topping. One is not enough, but, you won't use the full amount in the two tubs of whipped topping (sorry if that is confusing)