01 - Preheat oven to 350°F. Grease a 9x13-inch baking dish with butter or nonstick spray.
02 - In a large mixing bowl, whisk together sour cream, melted butter, and eggs until the mixture is smooth and well incorporated.
03 - Fold in the whole kernel corn and cream-style corn, stirring until evenly combined.
04 - Gently add Jiffy Corn Muffin Mix, salt, and black pepper. Stir until just combined, being careful not to overmix the batter.
05 - Pour the prepared mixture into the greased baking dish and spread evenly using a spatula.
06 - Place the dish in the preheated oven. Bake for 45 to 50 minutes until the top is golden and the center is set.
07 - Allow the casserole to cool for 10 minutes before portioning and serving.