Preheat the air fryer to 380°F (193°C). Give it 3–5 minutes so the basket is hot. Preheating helps with browning.
Prep the basket. Lightly spray the basket with oil or use a perforated liner to prevent sticking. Don’t over-spray.
Add the meatballs in a single layer. Keep a little space between them. Overcrowding leads to steaming instead of crisping.
Air fry for 10–12 minutes. Shake the basket halfway through. Smaller meatballs may finish in 8–10 minutes; jumbo ones may take 12–14.
Check doneness. They should be hot throughout and lightly browned. If using a thermometer, aim for 165°F (74°C) in the center for poultry or mixed-meat varieties.
Toss with sauce (optional). Warm your sauce separately, then toss cooked meatballs to coat. For a sticky glaze, air fry sauced meatballs 1–2 more minutes to set.
Serve right away. Top with parsley or Parmesan, or slide into rolls with melted provolone for meatball subs.