Preheat Oven and Prepare Baking Dish: Preheat your oven to 400°F. Lightly grease a 9x9 inch baking dish.
Cornbread Layer: In a medium bowl, combine the Jiffy Cornbread Mix, milk, egg, and drained green chiles. Stir until just mixed; it's okay if there are some lumps. Spread this batter into the bottom of the prepared baking dish. Bake for 15-20 minutes until cooked through and set.
Brown the Ground Beef: While the cornbread is cooking, in a large skillet over medium heat, brown the ground beef until it is no longer pink and drain any excess fat.
Add Mix-ins: Stir the taco seasoning into the cooked ground beef. Add the enchilada sauce, drained fire-roasted corn, and drained Rotel. Mix until combined and warm through then remove from heat.
Sour Cream & Cheese: In a medium bowl mix together sour cream and 1 cup of shredded cheese. Set aside.
Assemble: Spoon the beef mixture over the cornbread layer in the baking dish. Spread it evenly. Next, layer on the cheese/ sour cream mixture and spread it out evenly. Finally, sprinkle the remaining 1 cup of the Mexican blend shredded cheese over the top.
Bake: Bake in the preheated oven for 20 minutes or until the cheese is melted and bubbly and cooked through.
Serve: Let the bake rest for a few minutes after taking it out of the oven. Serve warm with your choice of optional toppings: diced tomatoes, shredded lettuce, black olives, and sliced green onions.