Remove ice cream from freezer to let it soften a little.
Place cookies in a large resalable plastic bag. With a rolling pin, smash the cookies until they form a coarse crumble.
In the bottom of a 9-inch spring form pan, spread all of the vanilla ice cream. Sprinkle half of the cookie crumbs on top of the ice cream. Top that with chocolate ice cream, spread to cover the cookies and place back into the freezer to harden for about an hour.