Preheat your oven to 400°F (200°C). Line your baking sheet with parchment paper or aluminum foil to prevent sticking and make cleanup easier.
In a large mixing bowl, combine the ground chicken, breadcrumbs, chopped green onions, minced garlic, grated ginger, salt, and pepper. Mix gently with your hands or a spatula just until combined—overmixing can make meatballs tough.
Roll the mixture into 1 1/2-inch meatballs and place them evenly spaced on the prepared baking sheet.
Scatter the pineapple chunks around the meatballs on the pan. The pineapple will roast and caramelize, complementing the savory meatballs perfectly.
In a small bowl, whisk together the soy sauce, honey, and sesame oil until smooth.
Bake the meatballs and pineapple for 12 minutes, then remove from the oven. Brush the teriyaki glaze generously over each meatball and pineapple chunk. Return the pan to the oven and bake for another 8-10 minutes, or until the meatballs are cooked through and the glaze is caramelized.
Sprinkle the finished meatballs with sesame seeds and extra green onions if desired. Serve hot with steamed rice, noodles, or a crisp green salad for a balanced meal.