Preheat oven to 350°F.
Pour two boxes of Jiffy cornbread mix into a bowl. Add 1/2 pint of full-fat buttermilk, one cup of whole milk, and 1 cup of yellow cornmeal. Don't forget to add one tablespoon each of celery seed and ground or rubbed sage.
As the cornbread is baking, prep and sauté the onions, peppers, celery, and garlic, then set aside.
Use a serrated knife, cut the croissant into one-inch cubes, and set aside. Or, if you prefer a more breadcrumb style, put the croissants into the food processor and make croissant breadcrumbs.
Into a large bowl, crumble the cornbread and add the sautéed vegetables, seasoning, and half of the chopped uncured salame, prosciutto, and browned Italian sausage.
Brush melted unsalted butter or extra virgin olive oil. Brush the bottom and along the sides of a baking dish.
Spoon the cornbread mixture into the prepared baking dish, add three cupfuls of chicken or vegetable stock, and mix well.
Add the croissants and the remaining meat; make sure to distribute the meat over the top of the dressing equally.
Drizzle melted unsalted herb butter (recipe above) over the top of the croissant topping.
Place the dressing onto the middle rack of the 350°F oven, place a sheet of aluminum foil over the top of the dressing shiny side up, and bake for 45-50 minutes.
Remove from the oven and allow the dressing to cool for ten minutes.
Serve.