Roast potatoes, bacon, sausage, scampi, nuggests, fish bites etc. (all the processed stuff which normally would need oil can be cooked without as they are full of it anyway!
For more healthy options, vegetables can be roasted - remember a spoonful of Extra Virgin Olive Oil is a HEXB. Others have made curries, bolognese etc. in them.
Do a search on here, there's been loads of threads, you might like to try Paul Brodel's book, "Hot Air Frying" - he's the bloke who demontrates the Actifry on the Ideal World Informercials on TV.
Hot Air Frying: Amazon.co.uk: Paul Brodel, Dee Hunwicks: 9780956393531: Books
Steve