Preheat the oven to 450 degrees F.
Put the oil in a large cast-iron skillet or ovenproof baking dish and heat in the oven until the oil is piping hot, about 10 minutes.
Meanwhile, in a bowl, combine the cornmeal, salt and baking soda. Add the okra, onion, corn, banana pepper and chiles and toss to coat. Set aside. In a large measuring cup, combine the buttermilk and egg. Add the wet ingredients to the dry and stir to combine.
Remove the heated skillet from the oven and pour the hot oil into the batter. Stir to combine, and then pour the batter back into the hot skillet. Bake until golden brown, about 35 minutes. Remove to a rack to cool slightly. Using a serrated knife, slice into wedges and serve warm.
"Lighten Up, Y'all" by Virginia Willis © Ten Speed Press, a division of Penguin Random House, Inc 2015. Provided courtesy of Virginia Willis. All rights reserved.