Chocolate Cookie Ice Cream Slice (Kraft Foods)

5 C. chocolate ice cream, slightly softened (Or whatever flavor ice cream you prefer)
14 Chips Ahoy! Cookies, crushed
1/4 C. butter, melted
1 1/2 C. thawed Cool Whip
1 square Baker's semi-sweet chocolate

Line 9x5 inch loaf pan with foil, with ends of foil extending over sides. Spread ice cream onto bottom of pan. Mix cookie crumbs and butter. Sprinkle over ice cream. Cover with ends of foil. Gently press crumb mixture into ice cream. Freeze 6 hours or until firm. Invert dessert onto plate when ready to serve. Remove pan and foil. Frost dessert with Cool Whip. Coarsely grate chocolate square. Sprinkle over dessert.