Grease a 10" cast-iron skillet and place it in the oven on the middle rack. Preheat the oven to 450 degrees with the skillet in the oven.
(Coconut oil works better than olive oil for greasing the cast-iron skillet as it has a higher smoke point)
In a medium-size mixing bowl, combine cornmeal, eggs, milk, vegetable oil, sharp cheddar, and de-seeded, diced jalapenos ( 1/2 to 3/4 of a cup of diced jalapeños).
Mix thoroughly until there are no lumps of dry cornmeal left.
Using a hot pad, remove the cast-iron skillet from the oven and pour all the cornbread mix into it. Smooth it around until it is even and then put the skillet back in the oven.
Bake for 20-25 minutes or until the center of the cornbread is set and it is golden brown.
Once finished baking, remove from the oven and allow to cool 5-10 minutes before slicing and serving warm.
Enjoy!