I made this soup over the weekend while 2 of my grandkids were here and they loved it!

https://lifemadesimplebakes.com/cheesy-cauliflower-soup-7/?ck_subscriber_id=2839716971

I had ordered a bag of broccoli & cauliflower combined the last time I placed a grocery order, found it in the freezer and decided to use it.  I also added a couple of cut up raw, red Idaho potatoes so it took a bit longer to cook to perfect "doneness" but it tasted just wonderful.  I highly recommend this.  Teach your kids to love cauliflower and broccoli even if you have to smother it in cheese!  If you happen to have some leftover baked potatoes on hand, or even some baked sweet potatoes, I bet that would be good in it, as well.  Don't overdo the additions too much though, or you will take away from the original idea a bit drastically!