Always cook your foods in one layer Unless of course the recipe states that stacking is ok (like in these air fryer French fries and sweet potato fries recipes) These versions glance and performance much like a typical countertop toaster oven but they may have an air fry perform too. https://cook-companion-air-fryer79012.educationalimpactblog.com/52355272/the-greatest-guide-to-cook-companion-air-fryer