Banana Pudding Poke Cake

Ingredients

• 1 18 1/4 ounce box yellow cake mix (such as Duncan Hines®)
• 1 cup water
• 1/2 cup vegetable oil
• 3 eggs
• 2 cups cold milk
• 2 3 1/2 ounce packages instant banana pudding mix
• 1 8 ounce container frozen whipped topping (such as Cool Whip), thawed
• 1 cup vanilla wafer crumbs (such as Nilla, or to taste)