In a shallow glass bowl, combine orange juice and cornstarch; mix well. Stir in chicken. Cover and chill for 2 hours.
Drain chicken; discard juice mixture. In a small bowl, combine broth and soy sauce. Set aside.
In a wok or large nonstick skillet, heat oil over medium heat. Add garlic and ginger; stir fry for 30 seconds. Add chicken; stir fry for 3 minutes. Add vegetables; stir fry until crisp tender, about 5 minutes. Stir in broth mixture.
Place 1/2 c of rice on each serving plate. Top with the chicken mixture, dividing evenly.