I do this too - thick slices tubled into an ovenproof dish or even whole halves - seeds out and cut side down on a baking tray - about 30 mins at 200 C. Poke it to see if it's soft enough for your liking. And the skin will come off easily.
You can cook virtually any squash / pumpkin this way. Google is your friend if you need inspiration
Samjay I thought I was buying just BNS when I bought it ready chopped but then re-read the label and it had sweet potato too!!! Guess I really messed up Dukan style that day!!!! LOL x