01 - Preheat oven to 350°F. Grease a 9x13-inch baking dish or 2-quart casserole dish with butter or cooking spray.
02 - In a large mixing bowl, whisk together melted butter, sour cream, and eggs until completely smooth and blended.
03 - Add drained corn, creamed corn, and Jiffy Corn Muffin Mix. Stir until all ingredients are fully incorporated. Season with salt and pepper if using.
04 - Pour batter into prepared baking dish and spread evenly with a spatula to ensure uniform thickness.
05 - Bake for 45 to 50 minutes until top is golden brown and center is set. A toothpick inserted in the middle should come out clean.
06 - Let casserole cool for 5 to 10 minutes before serving to allow it to set and make serving easier.