I do a variation on a cauliflower cheese theme! Add some dijon mustard to the cheese sauce - gives it a bit of a kick! Transfer to an ovenproof dish and mix in some cooked pasta shells and cooked crispy mushrooms - then put under a hot grill until bubbling and any edges of exposed cauliflower florets/pasta shells start to brown.
I use reduced fat cheese and skimmed milk and therefore think this is healthy!