I just made these with my cousin's kids last night, and it was splendid because they could help out and it wasn't too messy. And they turned out fantastic. I'm sure you have all seen them, but I have a recipe book full of ways to use cake mixes besides making cakes. This is adapted from 101 Ways to use a Cake Mix:
White Chocolate Chip Chocolate Cookies
(1) chocolate cake mix
1/3 cup oil
mix together and add however many white chocolate chips you want (about half the bag)
bake at 350 degrees for 9-12 minutes.