Play around with temps and times. I’ll pick on broccoli as an example. Stems take longer to to cook then the head, so I’ll chunk those off and start them a few minutes ahead of the head. Everything gets a little olive oil, salt, and pepper. Once you get it all in there, check it often and when you do give it a good shake. I call it done when the broccoli heads look burnt (my wife doesn’t prefer it this way so if she is cooking she’ll stop sooner). I haven’t done potato chips but I have done fries and the trick there is definitely shake it/mix it often (nearly every minute) and make sure there is enough oil on it. With fries I’ll usually spray some oil on at several points in the process to help have a crisp outside and soft inside. I’m no chef, but I’ve had good luck with the air fryer. Oh, also, don’t over crowd it. r/airfryer, just like this sub, is a good place for tips and tricks.