Preheat the air fryer: Set it to 400°F (200°C) for 3–5 minutes. A hot basket helps the meatballs crisp on contact.
Prep the mixture: In a large bowl, combine ground turkey, breadcrumbs, egg, grated onion, garlic, parsley, oregano, salt, pepper, and red pepper flakes.
Mix gently with a fork or your hands until just combined. Avoid overmixing.
Form the meatballs: Lightly oil your hands. Scoop about 1 1/2 tablespoons per meatball and roll into smooth balls.
You should get 18–20 small meatballs.
Lightly oil for crispness: Brush or spritz the meatballs with a thin coat of olive oil, or lightly oil the air fryer basket to prevent sticking.
Arrange and cook: Place meatballs in a single layer with space between each. Air fry for 9–12 minutes at 400°F, shaking the basket halfway. Cook until browned and the centers reach 165°F.
Rest briefly: Let them sit for 2 minutes so the juices redistribute.
Finish with a squeeze of lemon for brightness if you like.
Serve your way: Toss with warm marinara over pasta, pair with a simple salad and rice, or serve as an appetizer with toothpicks and a dipping sauce.