In a food processor, chop:
18 large Oreos
1/4 C melted butter
Spread and press in the bottom of a greased pan.
In a double broiler, mix & melt:
14 oz can sweetened condensed milk
1 t vanilla
1 C semisweet chocolate chips
Spread on top of Oreo crust.
Sprinkle 1 C semisweet chocolate chips & 1 C little snack size Oreos on top OR 6 regular sized Oreos broken by hand.
Bake 20 - 25 minutes on 325°.
Let cool completely before cutting or they'll fall apart.