is there any way to doctor a yellow cake mix to turn it into chocolate?

hmm, I've never done that. Maybe you could add chocolate pudding mix and some cocoa? Or you could try chocoalte syrup? Or even melted chocolate? I would be interested to find out if anyone has tried doing this. Hopefully you will get some better answers!

I had DH French Vanilla cake that I added a doctored recipe to, I didn't have any vanilla pudding mix so I used chocolate. It had more of a sponge cake chocolate color. I don't know how it tastes, it was made for class and I don't want to cut it since it's going to my neighbors! Gotta get all the cake out of the house!!