Preheat the oven to 375F.
Now, whisk the eggs, then gradually pour in the melted butter. Add in the vanilla extract then gradually whisk in the buttermilk. Note, allow the butter to cool a little first. Do not pour super hot butter into the eggs.
In a separate bowl, combine the flour, cornmeal, sugar, baking powder and salt. Next, combine the dry and wet ingredients. Do not over mix. Pour the batter into the cast iron skillet.
Bake for 25-30 minutes or until a toothpick inserted comes out clean and the top is golden. Cook times will vary.
Allow the skillet cornbread to cool before slicing and serving.