In a large bowl, combine ground chicken, egg, breadcrumbs, soy sauce, garlic, ginger, sesame oil, pepper, rice vinegar, and green onions. Mix gently.
Shape into mini meatballs, about 1 inch in size.
Heat oil in a skillet or preheat oven to 400°F (200°C).
Cook the meatballs until browned on all sides and fully cooked (about 10–12 minutes stovetop or 12–15 minutes in oven).
In a saucepan, whisk together soy sauce, honey, rice vinegar, sesame oil, ginger, and garlic. Bring to a simmer.
Add cornstarch slurry and whisk until glaze thickens.
Toss cooked meatballs in the glaze or brush the glaze over them.
Serve warm.