This is very similar to the Smashed Cauliflower sticky. I may merge the two threads.
I estimate this as four servings. I just ran the main ingredients through fitday. Made with a medium head of cauliflower, 1½ cups reduced fat shredded cheese and a cup of light sour cream, the whole recipe is 841 calories or 210 per serving - maybe a bit high for a veggie serving but OK for a main dish. (I did not add in the margarine which would make it higher.)
Losing 13 pounds will put me back into the 170's