01 - Preheat oven to 350°F. Spray 9x13 pan with cooking spray.
02 - Combine whole kernel corn, creamed corn, and corn muffin mix. Add sour cream and melted butter. Stir until well combined.
03 - Pour mixture into the prepared pan. Bake for 45 minutes. Remove and add shredded cheddar cheese on top. Bake for an additional 5-10 minutes until cheese is melted.
04 - Let the casserole rest for 5 minutes before serving.