Preheat oven to 350°F (175°C). Grease a 9x13-inch baking dish generously.
In a large bowl, combine whole kernel corn, creamed corn, Jiffy mix, sour cream, eggs, and melted butter.
Stir gently until just combined—don’t overmix.
Pour mixture into prepared baking dish and smooth the top.
Bake uncovered for 45–50 minutes or until golden brown and set.
Let rest 10–15 minutes before serving for best texture.