Preheat your oven to 375°F (190°C). Grease a 9x13 inch casserole dish with cooking spray or butter.
In a skillet, cook the ground beef or turkey over medium heat until browned. Add chopped onion, minced garlic, and diced bell pepper. Cook until the vegetables are softened.
Stir in black beans, corn, salsa, ground cumin, chili powder, salt, and black pepper. Simmer for a few minutes until the mixture is well combined and heated through.
Spread the meat mixture evenly in the bottom of the casserole dish. Add the shredded cheddar cheese over the top.
In a large mixing bowl, combine the Jiffy Corn Muffin Mix, milk, eggs and cream-style corn. Mix until just combined. Some lumps are okay.
Pour the cornbread batter over the meat and cheese layers. Spread it evenly over the other layers.
Bake the casserole in the oven for 30-35 minutes until the cornbread is golden and cooked through. Test with a toothpick for doneness.
Allow the casserole to cool slightly before serving. Garnish with sliced jalapeños, sour cream and chopped fresh cilantro if desired.