Preheat oven to 400 degrees. Grease 10-inch cast-iron pan with bacon drippings. Combine all but the last two ingredients in a medium bowl and beat together. Fold in the shredded cheese and jalapeno until well combined and pour into greased cast-iron pan. Place in oven and cook 15 minutes. Check for doneness by inserting a toothpick into the center of the pan. If it comes out clean, it's ready. If not, bake a few more minutes, but no longer than 20 minutes total.