Use 9x13-inch pan.

FIRST LAYER:

24 crushed Oreo cookies
1/4 stick melted butter

SECOND LAYER:

1/2 gallon softened vanilla ice cream

THIRD LAYER:

2 (5 oz.) cans Hershey chocolate syrup
1 can Eagle Brand milk

Mix together and boil 5 minutes or until thick. Cool to lukewarm before layering.

FOURTH LAYER:

1 (8 oz.) carton Cool Whip

Sprinkle with 6-8 crushed Oreo cookies and freeze.