mine is the best
steam cauli till about half done, drain and set in shallow dish,
make a really thick white sauce, use a good spoonful of mustard (english or whole grain) and use less milk than usual, make the difference up with double cream or creme fraiche. Plenty of S&P, a suspicion of nutmeg and some fresh thyme is nice too.
The sauce needs to be so thick that it sits over the cauliflower like a big fat duvet not runny like soup
I only put a little cheese in the sauce
Give the cauliflower a generous covering of grated cheese and if you have odd bits of brie or mozzarella then poke that in and around the florets
tip the sauce over the cauliflower and then put even more grated cheese on the top...plus something bacony/pancetta/prosciutto on top
Into the oven with it until the cheese and bacon are singing with golden sizzleyness.
my cauliflower cheese is not veggie friendly!