Preheat the Oven:
Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish with non-stick spray.
Mix the Ingredients:
In a large mixing bowl, combine the whole kernel corn, creamed corn, sour cream, melted butter, and cornbread mix. Stir until just combined.
Add the Cheese and Seasoning:
Fold in the shredded cheddar cheese, salt, and black pepper. Mix gently to distribute the cheese evenly.
Pour and Spread:
Pour the mixture into the prepared baking dish. Use a spatula to spread it out evenly.
Bake:
Bake for 45–50 minutes, or until the top is golden brown and the center is set. A toothpick inserted into the center should come out clean.
Garnish and Serve:
Let the casserole cool for 5 minutes before serving. Garnish with fresh parsley or chives if desired.