Ranch Grilled Chicken

1 pkg ranch dressing mix
1/4 cup olive oil
1/4 cup vinegar
4 boneless skinless chicken breasts

Combine ranch dressing mix, olive oil and vinegar in large sealable plastic bag. Add chicken breasts and marinate in the frige for at least 1 hour. Grill on medium hot coals for 10 minutes or until juices run clear.