Using an oil mister over prepackaged spray oil is preferred for most air fryers. Some prepackaged spray oil contains a chemical/preservative that can cause damage to the non-stick surface of the air fryer.
A small air fryer will fit 4-5 chicken tenders at a time. Cook the first batch fully, set on a plate and cover in foil while the second batch cooks. Once the second batch is cooked, place the first batch back in the air fryer for an additional 1 minute to heat back up.
Find it online: https://allguiderecipes.info/air-fryer-naked-chicken-tenders/