Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large mixing bowl, combine ground chicken, breadcrumbs, grated Parmesan cheese, finely chopped green onions, minced garlic, beaten egg, soy sauce, sesame oil, salt, and pepper until evenly mixed.
Shape the mixture into small meatballs, approximately 1 inch in diameter, and place them on the prepared baking sheet.
Bake the meatballs for about 20-25 minutes, or until fully cooked and golden brown.
In a small saucepan, whisk together honey, Sriracha sauce, rice vinegar, and cornstarch (if using). Heat over medium heat, stirring constantly until the sauce thickens slightly.
Toss the baked meatballs with the honey Sriracha sauce until thoroughly coated.
Serve warm, garnished with additional chopped green onions or sesame seeds if desired.