Step 1

Reserve 1/2 cup vanilla wafer pieces; place remaining wafer pieces in a 9- x 13-inch baking dish.

Step 2

In large bowl, combine pudding mix and milk; whisk 1 to 2 minutes, or until smooth and thickened. Add half the whipped topping (about 2-1/2 cups) and sour cream; mix well. Refrigerate until ready to use.

Step 3

In a medium bowl, combine bananas and lemon juice; toss until evenly coated, then drain.

Step 4

Spread half the pudding mixture evenly over  wafers. Arrange banana slices over pudding mixture. Evenly spread with remaining pudding mixture.

Step 5

Top with reserved 1/2 cup wafers over pudding. Dollop with remaining whipped topping.