Crush the Oreos and place half of them in the bottom of a 9x13 baking dish.
Mix the cream cheese and butter until smooth. Mix in the powdered sugar, then fold in the whipped topping. Don't worry if it is a bit lumpy. Set it aside.
In a separate bowl, mix the milk and pudding until slightly thickened. Transfer it to the cream cheese mixture and mix until smooth.
Pour that over the Oreos in the baking dish, then top with the remaining crushed Oreos. Refrigerate for at least 2 hours to let it set.
When it is ready to serve, top it with the Easter Candies of your choice.
Notes
This cake can be made up to 2 days in advance. Cover it tightly and store it in the fridge. Top with the candies when ready to serve.I do not recommend freezing this as the pudding center will become runny when it thaws. Store leftovers in the fridge for up to 3 days.