Preheat the oven to 375°F. Spray an 13x9-inch baking dish with cooking spray and set aside.
In a large mixing bowl, whisk together the cornmeal, cream corn, buttermilk, green chiles, vegetable oil, granulated sugar, eggs green onions and salt. 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 few drizzles of vegetable oil. Add garlic.
Cook until no pink remains in the beef then drain any excess fat from the pan.
To the pan add taco sauce, taco seasoning, seasoned salt, lemon pepper and cumin. Simmer for 3-5 minutes. Remove from the heat.
Assemble the Cornbread: Pour 1/2 of the cornbread batter into the prepared baking dish.
Using a tablespoon, drop the ground beef evenly over the cornbread batter. Sprinkle beef 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 cheese. Continue to bake for 10-15 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.