Start by pulsing the Golden Oreos in a food processor until they turn into fine crumbs. Keep aside about 1½ cups of crumbs for later use. Mix the rest with melted butter until the texture resembles wet sand. Press this mixture firmly into the bottom of a 9×13-inch dish to form a solid crust layer. Place it in the fridge while you prepare the next layer.
In a mixing bowl, beat softened cream cheese until smooth and creamy. Add instant vanilla pudding mix and slowly blend in 2 cups of heavy cream, mixing well between additions. Stir in the key lime juice for that signature tart flavor. Reserve about ⅔ cup of this filling and spread the remaining mixture evenly over the chilled crust.
Take the reserved 1½ cups of Oreo crumbs and sprinkle them evenly on top of the cream cheese and lime filling. This creates a crumbly, slightly crunchy layer that balances the creamy textures. Make sure the crumbs cover the entire surface for even layering in every bite.
Whip the remaining 3½ cups of heavy cream with powdered sugar until medium peaks form. Set aside about one-third of this whipped cream. Fold the rest into the reserved ⅔ cup cream cheese mixture along with the lime zest. Spread this creamy, lime-zested mixture over the cookie crumb layer. Then, use the reserved whipped cream to spread or pipe neatly on top as the final layer.
Refrigerate the dessert for at least 6 hours, or preferably overnight, so all the layers set and flavors blend together. Slice into squares before serving. For a refreshing twist, you can also freeze it and serve as a chilled, frozen treat.