How to Make It
Add 36 chocolate cookies to a large zip-top plastic bag and crush, using a rolling pin or meat mallet, until fine crumbs form.
Transfer crumbs to a large bowl. Stir in melted butter. Transfer the mixture to a 9x13 baking dish. Press crumbs into the bottom of pan. Place in refrigerator to chill while working on other layers.
Mix the cream cheese with a mixer until light and fluffy. Add granulated sugar and 2 tablespoons milk and mix well. Stir in 1 1/4 cups Cool Whip. Spread mixture over cookie crust.
In a bowl, combine chocolate instant pudding with 3 1/4 cups cold milk. Whisk for several minutes until pudding begings to thicken. Spread mixture over previous layer. Allow the dessert to rest for 5 minutes so the pudding can firm up further.
Spread the remaining Cool Whip over the top. Sprinkle evenly with mini chocolate chips. Place in freezer for 1 hour or in refrigerator for 4 hours before serving.