My air fryer/toaster oven came with a little recipe booklet.
My family uses it to reheat a lot of leftovers. They hardly use the microwave anymore. My husband likes to put butter on burritos and cook them in the air fryer - they turn out crispy. I buy breaded chicken tenders and fish patties from the local restaurant supply store, they turn out perfect. Everyone's schedules are so wonky, we can't always have dinner together. It's nice to have these options for backup.
My favorite recipe for the air fryer is jo-jo potatoes. There are tons of recipes out there, just search for "air fryer jo jo potatoes". We like ours nice and spicy.