Begin by preheating your oven to 400°F (200°C) to ensure it's hot when your casserole is ready to bake.
In a large mixing bowl, combine the cornmeal, milk, creamed corn, rinsed black beans, shredded cheddar cheese, baking powder, sugar, and salt. Use a whisk or spoon to mix thoroughly until the ingredients are evenly distributed and the mixture is smooth.
Next, pour in the melted butter and stir until the batter is homogenous and aromatic.
For those who enjoy a spicy kick, gently fold in the sliced jalapeños, ensuring they are evenly mixed throughout the batter.
Grease a 9x9-inch baking dish or an oven-safe skillet with cooking spray or butter, and then pour the cornbread batter into the dish, spreading it out evenly with a spatula.
Place your casserole in the preheated oven and bake for approximately 25-30 minutes, or until the top is a beautiful golden brown and a toothpick inserted into the center comes out clean.
Once baked, allow the casserole to cool for about 5 minutes; this will make slicing easier. Cut into squares for serving.
Notes
Serve warm with fresh cilantro or green onions and a dollop of sour cream.