For a spicier kick, use a spicier taco seasoning or add a pinch of cayenne pepper to the beef mixture. Feel free to customize the toppings to your liking. Consider adding diced avocado, chopped tomatoes, or a drizzle of hot sauce. For best results, use a well-seasoned cast iron skillet. If you don't have one, you can transfer the beef mixture to a greased baking dish before topping with the cornbread batter. To prevent the cornbread from browning too quickly, you can loosely tent the skillet with foil during the last 10 minutes of baking.