Cook quinoa according to package directions; set aside.

Pound chicken breast with the back of a meat mallet and add to a shallow dish. Pour dressing over chicken, turn to coat both sides, then refrigerate for at least 5 minutes.

Spray a grill pan with cooking spray and heat over medium-high.

Remove chicken from dish and discard dressing. Grill for 5 minutes on each side or until chicken is cooked through.

Meanwhile, place green beans in a microwave-safe dish, adding enough water just to cover the bottom. Cover and microwave until beans are crisp-tender.

Serve chicken with quinoa, green beans, and grapes on the side.