Banana Pudding Ice Cream Cake

Ingredients

• 1 box vanilla cake mix, plus ingredients called for on box
• 3 c. heavy whipping cream
• 1/4 c. vanilla pudding mix
• 1 c. sweetened condensed milk
• 1 tsp. pure vanilla extract
• 3/4 c. crushed Nilla wafers
• 2 sliced bananas, divided
• 1/2 c. crushed Nilla wafers, plus more for garnish
• 20 whole Nilla Wafers