Cook the ground meat with the onions until done. Add the taco seasoning and tomatoes. Prepare Cornbread mix according to directions. Add the splenda, bell pepper, and jalapeno. Spray 13x9 pan and pour 1/2 of cornbread mix into pan. Top with meat mixture and then corn and 1/2 of cheese. Then top with remaining cornbread mix and cheese. Cook 35 min until done! Garnish with Salsa, sour cream and avacados!