1. Preheat oven to 400°. Heat butter in a 9-inch cast-iron skillet in oven 5 minutes or until butter melts.
2. Combine sour cream, eggs, and corn in a medium bowl. Whisk in cornmeal mix just until combined. Whisk in melted butter. Pour batter into hot skillet.
3. Bake at 400° for 30 minutes or until golden brown.