Crush cookies in a plastic bag and put in a 9 13 inch pan. Melt the chocolate chips and margarine and pour some into 3 beaten eggs and cook 1 or 2 minutes, then pour in the rest of the chocolate mixture. Add powdered sugar and nuts and pour over cookie crumbles. Freeze until hard. Soften 1/2 gallon ice cream and whip. Pour over chocolate and freeze. Get out 15 minutes before serving to cut.