Preheat oven to 350 degrees F. Grease a 9x13-inch baking dish with butter or nonstick spray.

In a large bowl, combine the Jiffy mix, drained whole kernel corn, creamed corn, sour cream, eggs, and melted butter. Stir until just combined.

Pour the batter into the prepared baking dish and spread into an even layer.

Bake for 45 minutes, until the top is deeply golden brown and a toothpick inserted in the center comes out clean.

Let rest for 5 minutes before slicing and serving warm.