Preheat oven to 350°. Mix flour, butter and pecans thoroughly
in bowl and spread in a 9 x 13-inch baking dish. Pat down evenly
in pan and cook for 15 minutes. Let cool. Mix powdered sugar
and cream cheese with a mixer, then fold in Cool Whip. Spread
evenly over crust. Next mix pudding and milk with mixer. Spread
evenly over cream cheese mixture. Use the rest of the Cool Whip
from a large container spreading evenly. Refrigerate until ready
to eat. Before serving, shred a chocolate bar and sprinkle
on top or chopped pecans.