Preheat oven to 350 degrees F.
Prepare baking dish by misting with cooking spray. (Dish used was an 10.5 x 7.5 casserole dish, but an 8 x 8 square will also work well. A 9 x 13 pan will make the casserole thinner and require more cornbread mix to cover the whole casserole. If you choose to make it in a 9 x 13, increase the ingredients by half, but use 16 oz. of cornbread mix,)
cooking spray
Brown and crumble ground beef in a large skillet over medium-high heat until cooked through and no longer pink. Add diced onion and cook until softened, about 5 minutes.
1-1/2 lbs. ground beef (93% lean), 1 medium yellow onion, diced
Add taco seasoning and water and cook for one minute. Remove from heat. Drain any excess grease if you have any.
1 oz. taco seasoning, 3 tbsps. water
Add corn, enchilada sauce, chiles and 1/2 cup shredded cheese to the meat mixture. Stir until combined. Spread meat mixture on the bottom of the baking dish. 1 (15 oz.) can yellow corn, 1 (15 oz.) can red enchilada sauce, 1 (4 oz.) can diced green chiles, 1-1/2 cups shredded Mexican cheese, divided
Prepare cornbread mix according to package directions (do not bake) and spread evenly over the top of the meat mixture with a large spoon or flat spatula.
1 (8.5 oz.) box cornbread mix, such as JIFFY
Sprinkle the remaining cheese over the top of the cornbread mixture.
Bake for 30-40 minutes, or until bubbling and the cornbread is fully cooked through (comes out clean with a toothpick in the center).
Slice and serve warm with sliced green onions or any other toppings you prefer.
garnish: sliced green onions (optional)