Fourthaxis:
When I don't want to roast, I peel and blend them raw then cook with olive oil/butter, salt & garlic - cooks faster that way - sprinkle some herbs and you got a great savoury mash. Of course oven is much easier and quicker though.
I often slice them fairly thin or like French fries and toss with olive oil and herbs to roast and they are done quickly or even boil and treat like mashed potatoes. I’d heard they are good “baked” in the Instapot and wanted to give it a try. They were tasty but not sure it was worth the extra clean-up of the machine. I’m just experimenting as I go along. I do love cooking beans in it. One of these days I’m going to try a cheesecake recipe I found in the Insta. ^^