Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large bowl, combine the ground chicken or turkey, breadcrumbs, cilantro, green onions, garlic powder, ginger powder, salt, and pepper. Mix until all ingredients are evenly incorporated.
Scoop out portions of the mixture (about 1.5 tablespoons each) and roll them into balls. Place them on the prepared baking sheet, spacing them about 1 inch apart.
Bake in the preheated oven for about 15-20 minutes, or until they are golden brown and cooked through.
While the meatballs are baking, whisk together the pineapple juice, soy sauce, brown sugar, and rice vinegar in a small saucepan over medium heat. Bring to a gentle simmer, stirring occasionally, until the sauce thickens slightly (about 5 minutes).
Once the meatballs are done, remove them from the oven and add them to the saucepan with the teriyaki sauce. Add the pineapple chunks and gently toss everything together until the meatballs are well-coated in the sauce.
Transfer the teriyaki pineapple meatballs to a serving dish and sprinkle with sesame seeds for garnish.