Preheat oven to 400. Stir together beef, breadcrumbs, egg, ginger, soy sauce and garlic powder in a large bowl. Shape mixture into 2-inch meatballs; place on a lightly greased wire rack set over a rimmed baking sheet.
Bake meatballs 20 minutes or until no longer pink in centers
meanwhile, heat teriyaki sauce in a large skillet over medium-low heat. Add meatballs; stirring to coat with sauce