Prepare the Mixture

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Mix Ingredients: In a large mixing bowl, combine sweet corn, cream-style corn, sour cream, melted butter, cornbread mix, and half of the shredded cheese. Stir until well combined. Season with salt and pepper to taste.
3. Add Green Onions: If using, fold in the chopped green onions for added flavor.

Bake the Casserole

1. Prepare the Baking Dish: Grease a 9×13-inch baking dish or spray it with non-stick cooking spray.
2. Pour the Mixture: Transfer the corn mixture into the prepared baking dish and spread it evenly.
3. Top with Cheese: Sprinkle the remaining shredded cheese on top.
4. Bake: Bake in the preheated oven for 45-50 minutes, or until the top is golden brown and a toothpick inserted in the center comes out clean.