I love cauliflower cheese, but I don't make it very often, because it uses too many pans & untensils.
But OMG - Sainsbury's frozen CC in a bag is great! You just stick it in a casserole dish and put it in the oven for about 40 mins. I sprinkled some extra cheese on top. It tastes as good as home made, and it's so easy. I am a convert.