Step 1: In a bowl, mix ground chicken, onion, garlic, egg, breadcrumbs, soy sauce, ginger, sesame oil, salt, and pepper. Form into 16–18 meatballs.
Step 2: Heat oil in a skillet over medium heat. Cook meatballs 8–10 minutes until browned and cooked through. Remove and set aside.
Step 3: In the same skillet, combine soy sauce, honey, rice vinegar, sesame oil, garlic, and ginger. Simmer.
Step 4: Stir in cornstarch slurry. Cook 1–2 minutes until thickened.
Step 5: Return meatballs to the skillet and toss to coat. Heat 2–3 minutes.
Step 6: Serve meatballs over rice, garnished with sesame seeds and green onions.