Preheat oven to 400 degrees F.
Heat a 10-inch cast iron skillet and add the bacon. Cook, stirring often, until the most of the fat has rendered from the bacon and the bacon is crispy, 7 to 8 minutes. Using a slotted spoon, remove the bacon from the pan and reserve. Transfer the skillet with bacon drippings to the oven. In a medium mixing bowl, combine the dry ingredients with the Cheddar. In a second mixing bowl, combine the buttermilk, oil, eggs, and jalapeno and add the wet ingredients to the dry ingredients, mixing just until dry ingredients are moistened. Season the crawfish tails with the Essence and fold them and the bacon into the cornbread batter. Remove the hot skillet from the oven and add the cornbread batter to the hot pan. Bake until light golden brown and a wooden toothpick inserted in the center comes out clean, 25 to 30 minutes. Serve warm.
Combine all ingredients thoroughly.
Recipe from "New New Orleans Cooking", by Emeril Lagasse and Jessie Tirsch, published by William Morrow, 1993.