Mix cream cheese, butter, powdered sugar, and dry milk together with hands.
Add peppermint extract and green food coloring and continue mixing to incorporate.
Mix in approx. 20 Oreo cookies, broken into large chunks.
Press mixture into buttered 9x13 inch pan and top with remaining Oreo cookies, finely crushed. *For extra crunch, top just before serving.
Cut in squares; store in refrigerator.