01 - Preheat oven to 400°F. Line a baking sheet with parchment paper or lightly grease it to prevent sticking.
02 - In a large mixing bowl, combine ground chicken, breadcrumbs, egg, green onions, garlic, soy sauce, grated ginger, black pepper, and salt. Mix gently until just combined, being careful not to overwork the meat.
03 - Roll the mixture into uniform 1-inch meatballs and arrange them on the prepared baking sheet with even spacing.
04 - Bake for 18 to 20 minutes until the meatballs are cooked through to an internal temperature of 165°F and lightly golden on the outside.
05 - While the meatballs bake, combine pineapple juice, soy sauce, rice vinegar, brown sugar, and ketchup in a saucepan over medium heat. Bring to a gentle simmer, stirring occasionally.
06 - In a small bowl, dissolve cornstarch in water to create a slurry. Whisk the slurry into the simmering sauce and cook for 2 to 3 minutes until the sauce thickens to a glossy glaze consistency.
07 - Stir the drained pineapple chunks into the thickened sauce and simmer for an additional 2 minutes to heat through.
08 - Transfer the baked meatballs into the saucepan with the pineapple sauce. Toss gently to coat evenly and cook for 2 to 3 minutes until the meatballs are thoroughly glazed and heated through.
09 - Serve hot, garnished with fresh chopped cilantro or parsley, alongside steamed rice or noodles if desired.