Use your favorite cornbread recipe.  I personally like to use Aunt Jemima Self-Rising Corn Meal Mix, Martha White Cornbread Mix, or White Lily Self-Rising Buttermilk White Cornmeal Mix.  The flour, salt, and baking powder are already blended in, plus, it's consistently delicious (and I love how little hassle there is when you use the bagged stuff). Follow the recipe on the package label.