Here's an easy birthday cake that the kids will love:
Bake a chocolate cake. While the cake is baking, mix up a large package of chocolate pudding and let set in the fridge.
While cake is still warm - crumble the cake. Set aside 1/2 c. of the crumbled cake to sprinkle on top when done. (Sorry picture wouldn't rotate for me)
Mix Chocolate cake crumbs, pudding, crushed oreos, and gummy worms together to make "mud". Spoon into dump truck and onto "road". Sprinkle the top with remaining crumbs to make it look like fresh dirt.