1. You do not need to add any oil while cooking since frozen hash browns already have oil in them. I always check the nutrition label and pick a brand that use low oil. 2. You can air fry for a couple of minutes more in case you want them to be darker. 3. I can cook 6 patties at one go in my Philips basket type air fryer, but you can easily cook 3-4 patties at one time too. There wasn’t much of time difference when doing a smaller batch. Just a minute or two less works. 4. If you do not preheat your air fryer, then you will need more time for the first batch. 5. The recipe for from scratch hash brown patties is shared as well in the notes. 6. You can use leftover mashed potato for making potato patties too.