I use the White Lily Buttermilk White Cornmeal Mix and follow the recipe on the bag for Southern Cornbread. It's really easy, just 2 cups of the Cornmeal, 1 egg, 1/4 cup oil, and milk (or buttermilk iin my case).
Been using that for years. If you want yellow rather than white, they've probably got that too, I just prefer the white.