Brown sausage and onion, drain off excess fat. Set aside. Combine cornbread mix and cream style corn in small bowl. Pour 1/2 of corn/cornbread mixture into bottom of iron skillet. Layer sausage, jalapeno and cheese. Add remaining cornbread mixture. Bake for 45 minutes at 350 degrees.
Note: For best results use iron skillet. Grease and sprinkle small amount of dry cornbread mix. Place in oven until lightly browned to keep from sticking.