Got a box of dark chocolate/fudge brownie mix, and there was a recipe suggestion on the back that I just had to try.
Basically it cut the water and vegetable oil amounts roughly in half (from 1/3 cup to 3 tbsp), added in 1/4 tsp cinnamon (and espresso, but I didn't do that part), and white chocolate chips, and turns them into double chocolate chip cookies.
OH EM GEE they are so good. The little addition of cinnamon is frankly genius, plus, I didn't realize I could use brownie mix for wonderful chocolate cookies. I've make chocolate cookies from scratch before, but these had a cool 'brownie-ish' texture or flavor (hard to pin down

) that was awesome.
Must recommend you try it!