Though you can technically make air fryer onions without oil, they don’t tend to turn out well. The oil helps keep the onion from drying out too early and burning. Oil-free onions that are half burnt and half raw aren’t on anyone’s menu.
I’ve seen recipes claiming you can cook a whole onion in the air fryer. However, some say the onion won’t get soft. Unless you’re cooking whole pearl onions, I’d stick to air frying chopped onions or sliced onions.
You can make air fryer dehydrated onions using the lowest temperature setting on your air fryer. Though they’ll take less time than using a food dehydrator, you’ll need to stir the onions far more often. Also, the air fryer can only dehydrate a very small batch of onions at a time.
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