Preheat and Brown Beef: Preheat oven to 400°F (200°C). In a large skillet over medium-high heat, brown ground beef. Drain excess grease.
Make Filling: Reduce heat to medium. Add cream-style corn, canned corn, and Rotel (undrained) to the skillet. Stir in taco seasoning, salt, pepper, and onion powder. Simmer for 5 minutes to thicken.
Combine with Cheese: Remove from heat and stir in 2 cups of shredded Mexican cheese blend until melted.
Assemble in Baking Dish: Transfer the mixture to a greased 9×13 inch baking dish and spread evenly.
Make Cornbread Topping: In a bowl, combine cornbread mix, eggs, and milk. Stir until well combined.
Bake: Pour cornbread batter over the ground beef mixture. Bake for 17-20 minutes, or until cornbread starts to brown.
Add Cheese and Finish: Sprinkle the remaining 1 cup of cheese over the cornbread. Bake for another 4-5 minutes, or until cheese is melted.
Serve: Remove from oven and let rest for a few minutes before serving.
