**1. Preheat the Oven:**
- Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish.
**2. Combine the Ingredients:**
- In a large mixing bowl, combine the Jiffy Corn Muffin Mix, whole kernel corn, creamed corn, sour cream, melted butter, and shredded cheese (if using). Mix until well combined.
**3. Pour into the Baking Dish:**
- Pour the mixture into the prepared baking dish and spread it evenly with a spatula.
**4. Bake:**
- Bake in the preheated oven for 45-50 minutes, or until the top is golden brown and the center is set.
**5. Serve:**
- Let the casserole cool slightly before serving. Serve warm as a side dish to your favorite main course.