Prepare rice according to package directions.
Heat oil in large skillet or wok over medium-high heat. Add chicken; stir-fry 5 to 7 minutes or until no longer pink. Add onion, broccoli, ginger and garlic to skillet; stir-fry 3 minutes more.
Combine reserved juice, soy sauce, stir-fry sauce, and cornstarch in a small bowl; add to skillet. Bring to boil, stirring constantly. Add pineapple. Reduce heat to low and simmer 2 to 3 minutes more. Serve over brown rice.