Preheat Oven: Preheat your oven to 400°F (200°C).
Cook Veggies and Beef: Heat a large cast iron skillet over medium heat. Add a bit of oil or tallow, then sauté the diced bell pepper and onion until softened (about 5-7 minutes). Add ground beef and taco seasoning, breaking it up as it cooks. Once browned, drain excess fat.
Prepare Filling: Stir in the beans, Rotel tomatoes, and corn. Combine everything well.
Prepare Cornbread Mix: Follow the package instructions to prepare the cornbread mix, being careful not to overmix the batter.
Assemble Casserole: Pour the beef mixture into a baking dish, spreading it out evenly. Pour the cornbread batter over the top, spreading it to the edges.
Bake: Place the dish in the preheated oven and bake for 30-35 minutes, or until the cornbread is golden brown and cooked through.
Optional Toppings: Top with sliced jalapeños before baking, and drizzle with hot honey after baking for extra flavor.
Serve: Let cool for a few minutes, then serve and enjoy!