In a medium mixing bowl whisk together the cornmeal, flour, baking powder, baking soda, salt, and pumpkin pie spice if using until combined.
In a large mixing bowl whisk together the eggs, brown sugar, honey, milk, and sweet potato. Then stir in the melted butter until combined.
Fold the dry ingredients until just combined, do not overmix.
Pour the batter into a 10" cast iron skillet and bake for 25-30 minutes or until a toothpick comes out clean or with a few moist crumbs. (If using a 12" cast iron just keep an eye on it sooner as it might bake quicker.)