Hawaiian Pineapple Chicken & Rice

Ingredients • 1 pound boneless, skinless chicken breasts • 1 cup pineapple chunks • 1 red bell pepper • 1 green bell pepper • 1 small onion • 1 cup chicken broth • 1/4 cup soy sauce • 2 tablespoons brown sugar • 1 tablespoon cornstarch • 1 teaspoon garlic powder • 1 teaspoon ground ginger • 1/2 teaspoon black pepper • 2 tablespoons vegetable oil