Preparation of the Crust: Begin by finely crushing the Lemon Oreos using a food processor. Transfer the crushed Oreos into a large resealable plastic bag and add the melted butter. Shake the bag vigorously to ensure thorough mixing of the butter with the cookie crumbs.
Forming the Base Layer: Empty the contents of the bag into a 9-x-13-inch baking dish. Press the buttered crumbs firmly and evenly across the bottom of the dish to form the crust. This will serve as the foundation for the dessert.
Creating the Cream Cheese Layer: In a medium-sized mixing bowl, combine the powdered sugar, softened cream cheese, softened butter, and half of the whipped topping. Using a hand mixer, blend these ingredients until the mixture is smooth and homogeneous. Pour this blend over the prepared crust, spreading it evenly.
Preparing the Lemon Pudding Layer: In a separate bowl, mix together the lemon instant pudding and milk. Whisk the mixture vigorously until the pudding thickens. Once thickened, gently pour this over the cream cheese layer. Place the dish in the refrigerator for a minimum of 5 minutes to allow this layer to set.
Adding the Final Layer: Remove the dish from the refrigerator and cover the pudding layer with the remaining whipped topping. Spread the topping evenly for a smooth finish. Refrigerate the dessert for at least 1 hour to ensure proper setting of all layers.
Garnishing and Serving: Before serving, garnish the dessert with lemon slices if desired. This adds a decorative and flavorful touch to the dessert.