01 - Preheat your oven to 350°F. Grease a 9x13-inch baking dish or a 2-quart casserole dish with butter or cooking spray.
02 - In a large mixing bowl, whisk together the melted butter, sour cream, and eggs until completely smooth and well incorporated.
03 - Add the drained kernel corn, creamed corn, and Jiffy Corn Muffin Mix to the bowl. Stir until all ingredients are evenly combined and no dry mix remains. Season with salt and pepper if desired.
04 - Pour the batter into the prepared baking dish and spread it 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 in the center comes out clean.
06 - Let the casserole cool for 5-10 minutes before serving to allow it to set for easier slicing.