Preheat the air fryer to 380°F (193°C) for 3–5 minutes. A hot basket helps the meatballs brown.
Mix the base: In a large bowl, combine ground turkey, breadcrumbs, egg, Parmesan, parsley, garlic, onion powder, salt, pepper, and smoked paprika.
Add 1 tablespoon milk or broth to start.
Check the texture: The mixture should be moist but hold together. If it feels dry or crumbly, add up to 1 more tablespoon liquid. Avoid overmixing to keep the meatballs tender.
Shape the meatballs: Lightly oil your hands.
Roll into 1–1.25 inch balls (about 18–22 meatballs). Keep sizes consistent for even cooking.
Prep the basket: Spray the air fryer basket with olive oil. Arrange meatballs in a single layer, leaving space between each.
Work in batches if needed.
Light mist on top: Give the meatballs a quick spray for better browning.
Air fry for 8–10 minutes, shaking the basket or turning the meatballs halfway through. Cook until the outsides are golden and the centers reach 165°F (74°C).
Rest and serve: Let them rest 2–3 minutes to reabsorb juices. Serve with warm marinara, a squeeze of lemon, or over zucchini noodles, quinoa, or whole wheat pasta.