Rub chicken with jerk seasoning. In a large skillet coated with cooking spray, cook chicken in 1 teaspoon oil over medium heat for 3-4 minutes on each side or until juices run clear. Remove and keep warm.
In the same skillet, saute the asparagus, pineapple and onions in remaining oil for 2-3 minutes or until tender.
Combine the cornstarch, pineapple juice and mustard until smooth; gradually stir into the pan. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with chicken and rice.