The best cornbread I've ever had is my home baked Pamela's Cornbread and Muffin Mix. Not only is Pamela's Cornbread and Muffin Mix gluten-free, it's also Made in the USA making it a *best buy.
Be careful purchasing any cornbread mix that isn't specifically labeled as gluten free. If the corn used to make the mix was grown in proximity to a wheat field, or manufactured in a facility that also manufactures wheat/gluten products, then the cornbread mix isn't gluten free.
We were told by our pediatric gastro-enterologist to specifically stay away from the Quaker brand products as they rotate their corn/oat/wheat crops on the same fields.
Pamela's cornbread is my "go-to-staple" with grilled chicken, a nice salad or soup. I substitute 1 cup of fresh buttermilk to replace the regular milk for a more complex flavor.
Everyone LOVES it - even my most picky eater!