Preheat the air fryer: Set to 380°F (193°C). Lightly brush or spray the basket with olive oil to prevent sticking.
Mix the base: In a large bowl, add ground turkey, breadcrumbs, Parmesan, egg, parsley, garlic, onion powder, Italian seasoning, smoked paprika (if using), salt, and pepper.
Combine gently: Use a fork or your hands to mix just until combined. Do not overwork or the meatballs can get tough.
Shape the meatballs: Lightly oil your hands. Roll into 1 to 1.5-inch balls (about 18–22 meatballs from 1 pound).
Keep them the same size so they cook evenly.
Load the basket: Arrange meatballs in a single layer with a little space in between. Work in batches if needed—crowding prevents browning.
Air fry: Cook for 10–12 minutes, shaking the basket or flipping the meatballs halfway. They’re done when browned and the center reaches 165°F (74°C).
Rest and serve: Let them rest 2–3 minutes.
Squeeze a little lemon over the top if you like. Serve with sauce, over whole-grain pasta, zoodles, or a salad.