I can't believe I forgot to post this!
For my son's 6th birthday, he desperately wanted a worm cake. I thought it would be fun to make the cake in the shape of a hill, so I baked it in the large, glass Pampered Chef measuring bowl. It worked beautifully! (Mix as directed on the box and bake at 350 degrees for about an hour.)
After the cake cooled, I frosted it generously with whipped chocolate frosting (store-bought, because why not??) and sprinkled crushed Oreos all over. That part got a little messy. Since the sides were sloped, I had to use my clean hands to pat the crumbs into place.
The gummy worms were the most fun part. They probably would have looked better if I had actually stuck some into the cake sides, but my son liked the look of them crawling all over each other. =)