Whisk together cornmeal, flour, sugar, baking powder, baking soda and salt in a large bowl. Set aside. Whisk together egg and buttermilk, stir into flour mixture. Add cheese and scallions, and jalapeno if you are going for a little kick.
Melt butter in a 10 inch cast iron skillet. Swirl to coat bottom and sides. Pour batter into skillet and smooth out mixture slightly. Bake in the oven for approximately 20-25 minutes.
Recipe by FEASTS AND FOTOS at https://www.feastsandfotos.com/2012/04/27/skillet-cornbread/