In a bowl, mix chicken, panko, egg, 1 tbsp soy sauce, garlic, ginger, and pepper until combined.
Form into 1-inch meatballs and set on a plate.
Heat oil in a large skillet over medium heat and brown meatballs, turning so all sides get color, about 6–8 minutes.
Whisk remaining soy sauce, honey, rice vinegar, and sesame oil in a small bowl.
Pour sauce over meatballs, reduce heat, and simmer 3–4 minutes until sauce thickens and meatballs are cooked through.
Serve meatballs over rice, sprinkled with green onion and sesame seeds.