Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large bowl, combine the ground turkey, breadcrumbs, green onions, minced garlic, grated ginger, and the beaten egg. Mix until all ingredients are thoroughly combined.
Form the mixture into meatballs, about 1 inch in diameter, and place them on the prepared baking sheet.
In a separate bowl, whisk together the soy sauce, honey, rice vinegar, and sesame oil to create the teriyaki glaze.
Brush half of the teriyaki glaze over the meatballs before baking. Reserve the other half for glazing later.
Bake the meatballs in the preheated oven for 20 minutes, or until they are cooked through and golden brown.
Remove the meatballs from the oven, and toss them gently in the reserved teriyaki glaze to coat.
Return to the oven for an additional 5 minutes to allow the glaze to caramelize slightly.
Once done, remove from the oven and allow to cool for a few minutes.
Garnish with sesame seeds and fresh cilantro if desired before serving.