if making multiple casseroles at once, figure out if any steps take a long time (like caramelizing onions in the next slide), and start with THAT while you measure, chop, and prep other ingredients! cream of xxx soups can almost always be subbed for other flavors. cream of chicken, celery, and mushroom all have delicious but similar flavors! reheating or finishing casseroles: TEMPERATURES are very forgiving. Almost all casseroles can be done at 325F-375F, so don't worry if your casseroles call for slightly different temps.