In a large bowl, mix together the Jiffy cornbread mix, corn, creamed corn, sour cream, shredded cheddar cheese, melted butter, and large egg until thoroughly combined.
1 box (8.5 oz) Jiffy cornbread mix, 1 can (15 oz) whole kernel corn, 1 can (14.75 oz) creamed corn, 1 cup sour cream, 1 cup shredded cheddar cheese, 1/2 cup (1 stick) salted butter, 1 large egg