01 - In a large bowl, combine ground chicken, egg, panko, green onions, soy sauce, mirin, grated ginger, garlic, salt, and black pepper. Mix until just combined—do not overwork the mixture to maintain tender texture.
02 - Wet your hands with water to prevent sticking and form the mixture into 16 evenly sized meatballs, approximately 1.5 inches in diameter.
03 - Heat vegetable oil in a large nonstick skillet over medium heat. Add meatballs and cook for 8–10 minutes, turning occasionally, until browned on all sides and cooked through to an internal temperature of 165°F. Remove and set aside on a plate.
04 - Wipe the skillet clean. In a small bowl, whisk together soy sauce, mirin, sake, sugar, cornstarch, and water until the cornstarch is completely dissolved.
05 - Pour the sauce mixture into the skillet and bring to a simmer over medium heat, stirring constantly until thickened and glossy, about 2 minutes.
06 - Return the cooked meatballs to the skillet and gently toss to coat them evenly in the sauce. Simmer for 2–3 minutes, allowing the glaze to adhere and the flavors to meld.
07 - Serve hot over steamed rice if desired. Garnish with freshly sliced green onions and toasted sesame seeds for added texture and visual appeal.