Well I've only just discovered marmite roasters from this thread
I steam my potatoes cut to size ( or par boil) drain spray frylite, squirt marmite, stir carefully to coat, then I use my Phillips Airfryer around 30 mins 160. Or place in oven on tray and roast. Honestly if anyone gets money for Xmas the Phillips Airfryer is best thing money ever spent. I've lost 6 stone! And due to lack of money, a lot of meals made with chips
I only use mine for potatoes though. I hate the thought of getting it dirty with meat/fish etc. as soon as I tip the spuds out of it it gets in a bowl of hot water, wiped gently then do the large drawer the same, and left to drain while we eat, it looks as new as the day it was bought!