In a large bowl, combine the ground turkey, breadcrumbs, green onions, grated ginger, and minced garlic. Mix well until all ingredients are evenly incorporated.
In a separate small bowl, whisk together the soy sauce, honey, sesame oil, rice vinegar, and cornstarch until the cornstarch is dissolved and the mixture is smooth.
Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper for easy cleanup.
Form the turkey mixture into meatballs, about 1 inch in diameter, and arrange them on the prepared baking sheet.
Bake the meatballs in the preheated oven for 18-20 minutes, or until thoroughly cooked and slightly browned.
While the meatballs are baking, pour the teriyaki sauce mixture into a skillet over medium heat. Bring it to a gentle simmer, stirring frequently until it thickens (about 3-5 minutes).
Once the meatballs are cooked, transfer them to the skillet with the sauce. Gently toss them in the sauce until evenly coated.
Remove from heat and let the meatballs sit in the sauce for a couple of minutes to absorb the flavors.
Serve the teriyaki turkey meatballs hot, garnished with sesame seeds and fresh cilantro.