Grease a light metal 9x13 pan and line it with parchment paper.
In a mixing bowl, combine until smooth 1 1/2 cups all-purpose flour, 1 1/2 cup cornmeal, 1 cup granulated sugar, 1 tbsp baking powder, 1 tsp baking soda, 1 tsp fine sea salt, 1/2 cup melted butter, 1 1/4 cup buttermilk and 2 eggs.
Pour the batter into the pan and place in the oven. Bake for 35-45 minutes or until the internal temperature is 200 degrees F.
Remove and allow it to cool for 15 minutes before slicing.