I’m not sure about the trans fats (will check the next time I go to the grocery store), but the best cornbread mix I’ve come across is Marie Callender’s. Slightly sweet, but not overly so, rises higher and is fluffier than Jiffy.
Which one do you use? The original corn bread muffin mix, the original corn bread mix or the honey butter corn bread and muffin mix? lol
http://mccornbread.com/products/home.php?cat=249
I just looked online and they seem to be ok ingredient wise. It says they sell it at Costco so I’ll have to see it they have it.