Start by making the crust for the oreo cake. Place 2 of the 3 sleeves of Oreos in a large storage bag. Remove the air from the bag and seal. Crush the oreos until they’re crumbled. You may use a food processor to finely pulse if you’d like.
Melt the butter and pour into the plastic bag of crushed oreos. Toss together until all the butter is absorbed.
Line a 9x13 pan with parchment paper. Spread the crushed oreo mixture into the bottom of the pan to create an oreo cookie crust. Place in the freezer to harden.
In a large bowl, whisk together the cold milk and cookies & cream instant pudding, whisking for 5 minutes until pudding forms.
Fold in a thawed cool whip tub to the oreo pudding. Stir until combined. Tip: if it's still frozen, use an electric hand mixer to quickly soften!
Layer half of the cookies & cream pudding mixture into the oreo crust pan. Spread evenly.
Pour chocolate sauce on top of the cool whip layer and gently swirl.
Place the oreo thins in an even layer across the pan. I did a 5 column x 7 row grid.
Layer the remaining cookies and then cream pudding mixture on the cake. Spread evenly. With the last sleeve of the regular oreos, pulse a few times in a food processor or crumble in a plastic baggie again. Spread oreo crumbs on top. Drizzle the oreo pie with remaining chocolate fudge syrup.
Cover with tinfoil and place in the freezer. Allow the cake to set for at least 2 hours before serving. Store in the freezer but remove 15 minutes prior to serving for ease of cutting! ENJOY!