Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a 9x13-inch baking dish or similar-sized casserole dish.

Mix the Ingredients: In a large mixing bowl, combine the melted butter, sour cream, and eggs. Stir in the drained regular corn and creamed corn. Add the corn muffin mix and stir until just combined. Do not overmix.

Pour into Baking Dish: Pour the mixture into the prepared baking dish and 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 middle should come out clean or with a few crumbs.

Cool and Serve: Allow the casserole to cool for 5–10 minutes before serving. Optionally, garnish with fresh herbs or additional butter for extra flavor.