Break cauliflower apart into smaller pieces. Steam (or boil) cauliflower and drain well of all excess water.
In a small bowl, combine Miracle Whip (or Mayo), mustard and sugar, mix until sugar is well distributed. Stir Miracle Whip mixture together with cauliflower until all the cauliflower is evenly coated with the mixture.
Top with shredded cheese (you can put it all in an oven-safe dish in the oven to melt the cheese more or just to keep it warm until ready to serve).