30 crushed Oreo cookies
1/4 c. butter, melted
1/2 gal. vanilla ice cream
1/4 c. butter
2 sqs. unsweetened cocoa
2/3 c. sugar
2/3 c. evaporated milk
1 tsp. vanilla
1 med. container Cool Whip

Mix Oreo cookies and 1/4 cup melted butter. Press into bottom of 13 x 9 inch pan. Place ice cream on top of crumb mixture. Freeze. (I find it easiest to put ice cream on in numerous spoonfuls, then blend together). Mix 1/4 cup butter, unsweetened cocoa, sugar and evaporated milk. Cook over medium heat. Add vanilla when thickened and let cool. Top chocolate syrup mixture over ice cream. Freeze. Top with Cool Whip (and nuts, if desired). Thaw 10 minutes before serving.