Preheat your oven to 400°F and adjust the rack to the middle position. Line a large, rimmed baking sheet with parchment paper and set it aside.
In a medium bowl, combine the ground chicken, minced garlic, ginger, red pepper flakes, soy sauce (or tamari), sesame oil, chopped scallions, egg, and panko breadcrumbs. Use your hands to mix everything together until just combined; avoid over-mixing.
Shape the mixture into about 16 meatballs and arrange them on the prepared baking sheet.
Bake the meatballs for 12-15 minutes, or until they are fully cooked and golden brown on the outside.
While the meatballs bake, prepare the sauce. In a small bowl, mix together the soy sauce (or tamari), cornstarch, honey, sriracha, garlic, ginger, and sesame oil. Whisk until smooth.
Pour the sauce into a large skillet over low heat. Bring the sauce to a boil, whisking occasionally, and cook for 30-60 seconds until it thickens.
Turn off the heat and gently toss the baked meatballs into the sauce, ensuring they are well coated.
Garnish with sesame seeds and fresh scallions before serving.