1In large bowl, beat milk and pudding mix with electric mixer on low speed until well mixed; beat in yogurt. Fold in whipped topping.
2Place 24 vanilla wafers in a single layer in ungreased 13x9-inch (3-quart) glass baking dish. Spoon half of the pudding mixture over wafers. Place 6 sliced bananas over pudding mixture. Spoon remaining pudding mixture over bananas. Arrange remaining 24 vanilla wafers over top of pudding.
3Cover; refrigerate at least 3 hours but no longer than 8 hours. Just before serving, garnish with additional banana slices.