Stir together the crushed Oreos and melted butter in a mixing bowl. Then press evenly into the bottom of a 9-inch x 13-inch baking dish. Set aside.
Filling
Use a hand mixer to beat the cream cheese and butter together in a mixing bowl until smooth, about 3 minutes. Add in powdered sugar and mix for another 2 minutes.
Use a rubber spatula to fold the Cool Whip into the cream cheese mixture until combined. Set aside.
To a medium mixing bowl, add milk, instant pudding, and vanilla extract. Whisk for 2 minutes until thickened. Pour the pudding into the cream cheese mixture and mix to combine.
Place dollops of the cream cheese mixture all over the Oreo crust. Then spread into an even layer with an offset spatula or the back of a spoon.
Topping
Sprinkle 1/2 cup of crushed Oreos on top of the filling and place in the fridge for at least 3-4 hours to let the filling set up.
Then decorate with Peeps, mini candy eggs, sprinkles, and any other Easter candies desired. Cut into 12 slices and enjoy.