Preheat the air fryer: Set to 380°F (193°C) for 3–5 minutes. A hot basket jump-starts browning.
Add the meatballs: Place frozen meatballs in a single layer in the basket. Do not overcrowd. Leave space for air flow.
Optional spritz: If using very lean meatballs, lightly spray with oil for a crisper exterior.
Cook time: Air fry for 10–13 minutes, shaking the basket halfway.
Smaller meatballs lean closer to 10 minutes; larger or denser ones may need up to 14–15 minutes.
Check doneness: Look for deep golden spots and an internal temperature of 165°F (74°C) for poultry or as directed on the package. If not there, add 2 more minutes and check again.
Toss and serve: Transfer to a bowl and toss with your sauce of choice, or season simply with salt, pepper, and Parmesan. Serve hot.