Prepare a 9X13 inch baking dish by spraying it with non-stick spray.
In a large mixing bowl, stir together the corn, melted butter, sour cream, egg, onion powder, garlic powder, pepper, corn muffin mix, and pepper jack cheese.
Once combined, pour the mixture into the prepared baking dish and spread it evenly.
Place the dish in the oven and bake for 50 minutes until the top is golden.
After 50 minutes, sprinkle the cheddar cheese on top.
Return the dish to the oven for an additional 10 minutes until the cheese is melted.
Notes
Let the casserole rest for a few minutes before serving for easier cutting.