I've only recently begun making potatoes this way, but it has become a go-to side dish. I made fish tacos for dinner and these roasted potatoes worked really well with keeping our dinner light, yet satisfying. (Different varieties of potatoes may be more starchy than others, so I recommend rinsing them and then patting dry with a paper towel once sliced.)
I grew up with cauliflower, but fell out of the habit of eating it for some unknown reason. I'm so glad that the hubs likes it as well and we've been having cauliflower mash regularly. Don't let the fact that you have to clean, chop, cook, and puree put you off of this tasty dish, it is definitely worth it!
If you give these recipes a try, I'd love to hear about it!