Preheat oven to 400 degrees F. Line a baking sheet with parchment paper and spray with oil spray.
In a bowl, gently mix together turkey, ginger, garlic powder, onion powder, pepper, and salt. Shape into balls roughly 1.5-2 inch meatballs and place on prepared baking sheet.
Bake for 20 minutes till golden brown.
While meatballs are cooking, prepare the sauce: In a small bowl, mix together pineapple juice and cornstarch.
In a saucepan over medium heat, 1/3 cup water, maple syrup, and pineapple juice and cornstarch mixture and mix well. Whisk in vinegar and soy sauce and bring to a boil. Cook until sauce thickens, 2-3 minutes, whisking as necessary.
When meatballs are cooked, serve with sauce (on top of meatballs or on the side).