From: http://kedarhower.blogspot.com/2012/03/thin-mint-oreo-ice-cream-cake.html

Thin Mint Oreo Ice Cream Cake
makes a 9 inch pie pan (double for a 9x13 pan)

20 Mint Oreos, crushed
2 T. butter, melted
4 cups mint ice cream (mint cookie, mint chocolate chip, whatever you prefer), softened
1 cup Cool Whip + the rest of the container, softened
10 Thin Mints, crushed OR 10 more Mint Oreos, crushed

In a bowl, stir together the crushed Oreos and melted butter.  Press into the bottom of a 9-inch pie pan to form a crust.  Freeze for an hour.

In a large bowl, stir together the mint ice cream and the 1 cup of Cool Whip.  Pour into the pie pan over the now-frozen crust.  Freeze for about 20 minutes.

Sprinkle the top of the ice cream with the crushed Thin Mints (or extra Oreos).  Kind of press them into the top.  Spread with the rest of the Cool Whip.  Freeze for at least 2 more hours before serving.