I personally don't make a lot of casseroles, but we do have various types of soup at least once a week.
I've been pretty lucky for the most part as my little one's aren't really picky and the one dcb I had with sensory issues was easily worked around.
That said, my kiddos like to go in what I call "patterns." New dcg doesn't like tomato sauce, now none of them like tomato sauce.