Start by preheating your oven to 400°F (200°C). Line a baking sheet with parchment paper to prevent sticking and make cleanup easier.
In a large mixing bowl, combine the ground chicken with the breadcrumbs, chopped green onions, lightly beaten egg, minced garlic, grated ginger, soy sauce, and a generous pinch of salt and pepper. Mix gently until all ingredients are well incorporated, being careful not to overmix.
With your hands, shape the mixture into small meatballs, approximately 1 inch in diameter. Arrange them evenly on the prepared baking sheet, leaving a little space between each meatball for even cooking.
Drizzle the meatballs with sesame oil for added flavor and a nice sheen. Bake in the preheated oven for about 18-20 minutes, or until the meatballs are firm to the touch and have turned a lovely golden brown color.
While the meatballs are baking, prepare the teriyaki sauce. In a small saucepan, whisk together the soy sauce, honey, rice vinegar, cornstarch, and water. Place the saucepan over medium heat and continuously stir until the mixture thickens and begins to simmer, which should take about 3-5 minutes.
When the meatballs are finished baking, transfer them to a large bowl and pour the warm teriyaki sauce over them. Toss gently to coat each meatball evenly in the glossy sauce.
Serve the meatballs warm on a platter, garnished with a sprinkle of sesame seeds and additional sliced green onions.
Notes
Serve over rice or quinoa with steamed vegetables for a complete meal.