layered dirt dessert

My future race car driver requested this dessert.  I decided to replace my old dirt dessert recipe with this one because it was a hit, especially with the kids.  This recipe makes A LOT so be sure you have a lot of friends with sweet tooths (or should I say sweet teeth?) ready with spoons or forks...or you'll be eating this for days.  On your mark, get set, GO!

layered dirt dessert (adapted from Brown Eyed Baker)
1 package (about 15 ounces Oreo Cookies)
2 (3.9 ounces) packages instant chocolate pudding
4 cups milk
8 ounces cream cheese, at room temperature
1/4 cup butter, at room temperature
1 cup powdered sugar
8 ounces Cool Whip
1 small (20 ounce) chocolate cake ( I used a double chocolate cake with chocolate chips)
cars or gummy worms

Crush the Oreos into fine crumbs using a food processor or place the cookies in a resealable plastic bag and crush with a rolling pin; set aside.
In a large bowl, whisk together both boxes of the instant pudding with the milk for about 2 minutes.  Let sit for 5 minutes.
Meanwhile, beat together the cream cheese and butter on medium speed until light and fluffy; about 3 minutes.  Reduce the speed to low, add the powdered sugar, then gradually increase the speed back to medium until a fluffy texture is reached.
Using a rubber spatula, fold the cream cheese mixture into the chocolate pudding, then fold in the Cool Whip until completely combined.
Cube the chocolate cake and add to the cream cheese/pudding mixture.
Assemble the dessert by layering the layers of crushed Oreos and pudding mixture, beginning and ending with the crushed Oreos.
Refrigerate for at least 4 hours or overnight before serving.  Decorate the top with cars or gummy worms.