crush Oreos in Blender.Spray Pam in the bottom of a 13 x 9 inch pan. Sprinkle Oreos over the Pam. Spray 10 sprays of I Can't Believe It's Not Butter over the crumbs to keep them together. Mix non fat milk, Cool Whip Free (1 - 12 ounce container thawed) and pudding in a seperate bowl. Pour over the crumbs. Refridgerate for about an hour.