Preheat the oven to 350 degrees. Place the cotija cheese in the food processor, pulse until just crumbled and reserve 1/2.
In a medium bowl, combine the corn, mayonnaise, sour cream, jack cheese, garlic powder, chili powder, paprika, salt, lime juice, one-half the cotija cheese and egg. Whisk until combined. Grease a large disposable aluminum roasting pan with butter. Pour the mixture in the prepared pan and bake uncovered, for 45 - 60 minutes.
To serve, sprinkle remaining cotija cheese over the casserole.