In the bowl of a food processor, pulse Oreo cookies until they are fine crumbs. Add the melted butter and pulse a few times to combine.
Press the crumb mixture into the bottom of a 9x13-inch baking dish.
In a medium bowl, beat the cream cheese with the sugar and milk with a hand mixer until the mixture is light and fluffy. Gently fold in 8 oz. of the Cool Whip with a rubber spatula until the mixture is well combined.
Spread the cream cheese mixture evenly over the top of the crumb mixture. Refrigerate while preparing the next layer.
In a separate medium bowl, beat the chocolate pudding mix with the 2-1/2 cup of milk with a hand mixer until the mixture begins to thicken slightly.
Carefully spread the pudding mixture evenly over the top of the cream cheese layer.
Next, spread the remaining 8 oz. of Cool Whip evenly over the top of the pudding mixture. Sprinkle miniature chocolate chips over the top.
Cover and refrigerate for at least 4 hours before serving.
Notes
Do not remove the cream centers from the Oreo cookies.
You can use a zip-top bag with a rolling pin if you do not have a food processor.
Leftover Chocolate Lasagna Lush can be covered and refrigerated for up to 3 days. The texture may change slightly, but it will still taste delicious.
Chocolate Lasagna Lush can be frozen for up to a month. Just make sure to cover it well to prevent freezer burn and thaw in the refrigerator before serving.