**Make the crust**
Crush the Oreos in a food processor until fine crumbs form. Mix the crumbs with melted butter. Press firmly into the bottom of a 9x13-inch baking dish to form an even layer. Chill in the freezer for 10 minutes.
**Prepare the mint layer**
In a mixing bowl, beat the softened cream cheese, powdered sugar, and mint extract until smooth. If using food coloring, add a drop or two to achieve a light green hue. Gently fold in 1 cup of the whipped topping until well combined. Spread this mint cream mixture evenly over the chilled crust. Return to the refrigerator.
**Mix the pudding**
In a separate bowl, whisk together the instant chocolate pudding mix and cold milk for about 2 minutes, until thickened. Spread the pudding over the mint layer. Place back in the refrigerator for 10 minutes to set.
**Top with whipped topping**
Carefully spread the remaining whipped topping over the chocolate pudding layer. If desired, sprinkle mini chocolate chips or chopped Andes mints on top.
**Chill**
Refrigerate the dessert for at least 4 hours (or overnight) to allow layers to set and flavors to meld.
**Serve**
Slice and enjoy chilled. Store leftovers covered in the refrigerator.