For the crust: In a medium bowl, combine the Oreo cookie crumbs and melted butter. Press the mixture evenly into the bottom and up the sides of a 9-inch pie plate.
For the filling: In a blender, combine the softened vanilla ice cream, milk, peppermint extract, and green food coloring. Blend until smooth and creamy.
Pour the filling into the prepared crust and spread evenly.
Cover the pie and freeze for at least 4 hours, or until firm.
Before serving, top the pie with whipped cream and mini chocolate chips.
Notes
This pie is best served directly from the freezer. For a more intense mint flavor, you can add a touch more peppermint extract, but be careful not to overpower the other flavors.