Preheat oven to 350°F. Prepare a 9x13 baking dish with non-stick cooking spray.
In a large bowl, combine cake mix, eggs, 1 cup milk, and melted butter. Mix until smooth.
Pour the cake batter into the prepared baking dish and bake according to the directions on the cake mix box, usually 23-28 minutes.
Once the cake is done, immediately poke holes all over the cake using the back end of a kitchen utensil.
In a separate bowl, mix 3 1/2 cups cold milk with the instant banana cream pudding mix until you get a loose pudding consistency.
Pour half of the pudding mixture into the holes of the cake and spread the rest on top of the cake.
Slice the bananas thinly and layer them on top of the pudding.
Spread the Cool Whip over the bananas and smooth it out evenly.
Crush the vanilla wafers in a Ziploc bag, leaving some larger pieces, and sprinkle them over the Cool Whip layer.
Refrigerate the cake for at least 4 hours or overnight to allow the pudding to set and absorb into the cake.
Serve chilled and enjoy the delicious Banana Pudding Poke Cake!
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