Preheat the oven to 475˚F with a rack positioned near the top of the oven. Line a sheet pans with parchment paper or foil. If you use foil, spray it lightly with baking spray or rub with a bit of oil.
Combine the ground chicken, panko, scallions, bell pepper, cilantro, ginger, garlic, egg, sesame oil and kosher salt in a large bowl. Using your hands or a sturdy spatula, mix until combined.
Using an ice cream scoop or spoon, scoop up the mixture into 1 or 1 ½ inch balls and arrange them on the baking sheets, spaced about 2 inches apart. If you have time, refrigerate the meatballs for 30 minutes (or longer). You could also freeze the meatballs at this point.
Brush the meatballs with additional sesame oil or olive oil and bake for 10 minutes. (If meatballs are frozen, give them an extra 2-3 minutes.)
Remove meatballs from the oven. Using a fork, dip each meatball into the sauce then return to the baking pan. Bake for another 2-3 minutes until meatballs are nicely glazed
Brush the meatballs with more sauce and serve with toothpicks or cocktail forks and the remainder of the sauce in a small bowl for dipping. You can also pour the remaining sauce over the meatballs and serve meatballs in a bowl with toothpicks or cocktail forks on the side.
Garnish with sesame seeds (I like both light and black seeds), thinly sliced green onions and cilantro sprigs.