Well, the wife has moved the box of cookbooks & recipe cards somewhere that I can't immediately locate, but here's the general way I use a cast iron skillet for cornbread. Because I don't have the cornbread recipe itself, it's more of a general technique for y'all to adapt.
Prepare the batter for your favorite yellow cornbread recipe, and preheat the oven for same. I have a medium sized cast iron skillet, so I make enough batter for a 9X12 pan or 1 dozen good sized muffins. Set batter aside, but close to the stove where you can reach it.
Now, as the Cajuns say, you make a roux

Not alot, about one tablespoon
each of flour and oil or so in your iron pan over a medium heat. You've got to stay on top of it and stir it constantly while it's browning - I use a flat wooden "paddle" spatula. Don't let it sit and don't let it burn (if you get burned, black specks, throw it away and start over). What you're going for is a "blonde roux" (i.e.
very light in color). Once you reach that stage, swirl/stir it around so it's evenly distributed in the skillet and pour in your cornbread batter. Place the whole thing in the preheated oven and bake until done & slightly brown on top.
The roux makes the
best brown crust on the bottom of the cornbread you've ever tasted. Great with chili, stew, or just plenty of butter & honey.