Soak 5 to 6 chocolate chip cookies at a time in a shallow dish with milk in it. Allow them to soak only a short time, 15 to 20 seconds and line them in the bottom of a 9x12 inch cake pan. 
Cover with Cool Whip. Dip and soak more cookies and do second layer. Again cover with Cool Whip. Continue until you run out of cookies and whip. Sprinkle with chopped nuts. Refrigerate.