If you don't have creamed corn, you can use a substitute and still make corn casserole. I suggest using regular canned corn & alter it a bit. Only drain half the liquid from the canned corn. Then add the liquid and 1/2 the corn to a blender or food processor and pulse quickly for a few seconds. This will make a nice creamy corn mixture & stir it with the remaining corn pieces and add into the recipe as directed.