Adapted from i1084.photobucket.com
(21 oz.) can lemon pie filling
c. lemon wafer cookies, crushed
(8 oz. tub) Cool Whip
In bottom of glasses or dishes, sprinkle a few of the crushed cookies. Carefully layer lemon filling. Place Cool Whip in a plastic bag and cut off corner. Pipe Cool Whip on top of pie filling. Add more cookies. Repeat layers, ending with Cool Whip. Top each with a dusting of cookies. Dip lemon slices in sugar, coating both sides. Garnish each parfait with a lemon slice. Chill about an hour before serving. *NOTE* If you can't find the lemon wafer cookies, vanilla wafers would work just as well.