In a mixing bowl, combine the 2 cups of Oreo cookie crumbs with the melted unsalted butter. Mix until the crumbs are fully coated and resemble wet sand. Press this mixture firmly into the bottom of your pie dish to form an even crust.
In a separate bowl, whisk together the instant chocolate pudding mix and half and half until it thickens, about 2 minutes. Make sure there are no lumps in the mixture.
Gently fold in the 8 ounces of thawed Cool Whip into the chocolate pudding mixture until fully combined. This will give your pie a light and airy texture.
Spoon half of the chocolate pudding mixture onto the prepared Oreo crust, smoothing it out evenly. Then, sprinkle 1 cup of Oreo cookie crumbs over the pudding layer. Follow this with the remaining chocolate pudding mixture, spreading it evenly.
Top the final layer of pudding with the remaining Cool Whip, smoothing it out with a spatula.
Sprinkle the last 1/2 cup of Oreo cookie crumbs on top of the Cool Whip layer to create the “dirt.” Decorate with gummy worms, edible eyes, and spiders for a fun touch!
Cover the pie with plastic wrap and refrigerate for at least 2 hours to set before serving. This chilling time allows the flavors to meld beautifully.