In a large bowl, combine the ground chicken or turkey, breadcrumbs, green onion, cilantro, beaten egg, garlic powder, ginger powder, salt, and pepper. Mix well until evenly combined.
Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Roll the meat mixture into small meatballs, about 1 inch in diameter, and place them on the prepared baking sheet.
Bake meatballs in the preheated oven for around 15-20 minutes, or until they are cooked through and golden brown.
While the meatballs are baking, prepare the teriyaki sauce: In a small saucepan, combine the teriyaki sauce, soy sauce, sesame oil, and diced pineapple. Heat over medium heat until it begins to bubble, then reduce to a simmer for 5 minutes.
Once meatballs are cooked, remove them from the oven and add them to the saucepan with the teriyaki sauce. Toss to coat the meatballs evenly in the sauce.
Cook for an additional 5 minutes, allowing the flavors to meld and the sauce to thicken slightly.
Notes
Serve over steamed jasmine rice, garnished with sesame seeds and chopped green onions.