Stir together corn, creamed corn, melted butter, sour cream, egg, onion powder, garlic powder, pepper, corn muffin mix, pepper jack cheese and half of the cheddar cheese in a large bowl. Pour this mixture into the prepared pan.
30 ounces whole kernel corn, 30 ounces creamed corn, ½ cup salted butter, ½ cup sour cream, 1 large egg, ½ teaspoon onion powder, ¼ teaspoon garlic powder, ½ teaspoon fresh ground black pepper, 8 ounces corn muffin mix, 1 cup pepper jack cheese, 2 cups cheddar cheese