Preheat the oven to 350 degrees.
Prepare a 9X13 inch baking dish by spraying with non-stick spray.
In a large bowl, stir together corn, butter, sour cream, egg, onion powder, garlic powder, pepper, corn muffin mix, and pepper jack cheese. Pour this mixture into the prepared pan.
Bake for 50 minutes or until it starts to turn golden.
Remove from the oven, sprinkle on the cheddar cheese.
Return the dish to the oven for another 10 minutes or until it begins to brown.