Prepare pudding with low-fat milk as directed on package. Spoon one cup of pudding into a 2-quart serving bowl and top with 10 cookies and half of the banana slices. Continue layering with 2 cups of pudding, remaining cookies and bananas. Top with remaining pudding, cover and refrigerate for 3 hours or overnight. Garnish with whipped cream, graham cracker crumbs or banana slices, if desired.