Preheat the oven to 375°F. Spray an 13×9-inch baking dish with cooking spray and set aside.
In a large mixing bowl, whisk together the Jiffy Muffin Mix, creamed corn, buttermilk, green chiles, eggs and green onions until fully combined. Stir in 1 cup shredded cheese by hand.
Meanwhile, in a large skillet sauté chopped onion and ground beef over medium-high heat in a drizzle of oil.
Cook until no pink remains in the beef then drain any excess fat from the pan.
To the pan add taco sauce, taco seasoning, garlic salt, lemon pepper and granulated garlic. Simmer for 2-3 minutes until the seasonings have dissolved and incorporated. Remove the pan from the heat.
Assemble the Cornbread: Pour 1/2 of the cornbread mixture into the prepared baking dish.
Using a tablespoon, drop the taco meat mixture evenly over the cornbread batter. Sprinkle meat with 1 cup shredded cheese. Pour the remaining cornbread batter evenly on top.
Bake in the preheated oven for 30 minutes then sprinkle top with remaining 1/2 cup cheese. Continue to bake for 15-20 minutes or until the cheese is melted, the top is golden brown and a toothpick inserted into the cornbread comes back clean.
Let stand 5 minutes, then slice and serve garnished with fresh chives and a dollop of sour cream, if desired.