I tend to go for a creamy cauliflower soup if I'm low on calories (if it is too thin, I add a smidge of instant potato flakes.) I boil the cauliflower in chicken broth (2 to 1 ratio of cauiflower to broth) until cauliflwoer is very soft, add sauteed onions and garlic along with 1 oz cheese of choice then puree until creamy.
For a loaded potato taste, I use chives instead of white onion, add a dollop of sour cream or greek yogurt and some bacon or ham. Mmm!
Also makes a great "chowder" with corn, broccoli, etc.