I have the Ninja big one. It had a book that came with it & lots of good recipes in it. I've even baked a loaf of bread in it to see if it worked as the book said. It was good, hard crust & soft insides. You can google air fryer recipes & there are a ton out there. Some I've tried are great, others not so good.
I get ground sirloin, I mix it with a lot of spices then make two patties & then put cheese between them & carefully seal all around the two patties. Put that in my air fryer & when done yummy. You have a cheeseburger with the cheese inside of the two parties.