Preheat your oven to 400°F (200°C) and prepare a baking sheet.
In a large mixing bowl, combine ground turkey, panko breadcrumbs, green onions, egg, garlic, ginger, soy sauce, sesame oil, salt, and pepper. Mix gently.
Form the mixture into 1-inch meatballs and place them on the baking sheet.
Bake for 15-20 minutes until golden brown and cooked through, checking for an internal temperature of 165°F (75°C).
Heat teriyaki sauce in a small saucepan over medium heat until simmering. Optionally thicken with cornstarch mixed with water.
Transfer cooked meatballs to a serving bowl and drizzle with teriyaki sauce, tossing to coat.
Serve warm, garnished with sesame seeds and additional green onions.
Notes
Serve on a platter with steamed rice or vegetables for a complete meal.