If you're using a cast iron skillet*, you'll want to pre-heat the skillet for as long as it takes you to mix up your cornbread.
Go ahead and set the oven to 450° and put the skillet in the oven to pre-heat.
Mix the dry ingredients together, including the cornmeal, salt, baking powder, and baking soda. Set aside.
Add the buttermilk to the eggs and beat.
Then add the melted butter to the egg mixture and beat.
Add the wet ingredients to the dry ingredients, mixing well.
Take the pre-heated skillet out of the oven, and grease it well with bacon grease or cooking spray**, though I highly recommend bacon grease.
Bake the cornbread for about 15 minutes, or until a toothpick inserted in the middle comes out clean.
Remove the cornbread from the oven, and allow it to cool in the pan.
Serve with your favorite meal and enjoy!