PREPARE pudding with milk as directed on package.
SPOON 1/2 cup pudding in bottom of 2-qt. serving bowl. Top with 8 wafers, generous layer of sliced bananas and 1 cup pudding. Stand 12 wafers around outside edge of dish. Continue layering 12 wafers, sliced bananas, 1 cup pudding, 15 wafers, sliced bananas and remaining pudding. Cover.
REFRIGERATE 3 hours or overnight to soften cookies. To serve, spread whipped topping over pudding. Garnish with additional banana slices, if desired.