Preheat oven to 400 degrees, if using a cast iron skillet allow the skillet to heat up in the oven.
Whisk together dry ingredients. Stir in milk, oil, and egg, until just moistened. Carefully remove cast iron from oven and pour batter into it. Bake 15 minutes until golden brown.
If using glass baking dish cook 20-25 minutes.
Recipe by Supper for a Steal at http://www.supperforasteal.com/easy-side-homemade-cornbread/