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 well blended.
03 - Add drained kernel corn, creamed corn, and Jiffy Corn Muffin Mix to the bowl. Stir until all ingredients are fully incorporated. Season with salt and pepper if desired.
04 - Pour the batter into the prepared baking dish and spread evenly with a spatula to ensure uniform thickness.
05 - Bake for 45–50 minutes, or until the top is golden brown and a knife inserted into the center comes out clean.
06 - Let the casserole rest for 5–10 minutes before serving to allow it to set properly.