My son just told me he wants chocolate cupcakes for a party at school tomorrow and I only have a yellow DH cake mix. Can I add cocoa to make it chocolate? If so do I add more moisture? Would adding a chocolate pudding and extra egg work? I really don't want to run to the store at this time of night.

I think that would work.
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I have done this before. I just added cocoa until I thought i tasted chocolaty enough, and added just a small amount of buttermilk. I almost always use buttermilk in my cakes, but you could use water.

do both chocolate pudding and extra cocoa powder...gives the extra moisture (pudding) and deeper richer taste (pudding+cocoa).

Thanks so much, you guys are life savers!!!

If you happen to have choc. syrup around the house and pudding.. this is a great recipe from Lisa...

http://www.cakecentral.com/cake_recipe-1988-0-Blue-Ribbon-Moist-and-Fudgey-Chocolate-Cake.html

HTH!

I just did this the other day. I added chocolate pudding and chocolate syrup to the yellow cke batter and it was deklicious today. It wasn't as dark as a normal chocolate cake but tasted just as good.
TAB

You can also use some instant coffee or instant espresso crystals, dissolved in some of the water called for, to really bring out that chocolate taste. Or use regular coffee that has cooled to room temp. I did this the other day and the cake was outstanding! I also added a box of chocolate pudding.