Cornbread mixes are annoyingly one of those items that don't come in a consistent sizes. The nice thing about this recipe is that it's customizable based on what you have on hand. I like using the Sprouts brand of cornbread mix. You can also get 12 oz sizes in Krusteaz, Pamela's, Old School Brand, Paula Deen's, Teays Valley and more. If you like a less bread-y version of this recipe you can always use Jiffy which comes in 8.5 oz. Or for a more cornbread heavy recipe feel free to use a 15 oz box.