1. Combine first 9 ingredients. Place half of mixture in a zip-top plastic bag; reserve remaining mixture. Add chicken to bag; seal. Chill 2 hours.
2. Preheat grill to medium-high heat.
3. Remove chicken from bag. Sprinkle chicken with salt. Place chicken on a grill rack coated with cooking spray; grill 8 minutes on each side or until done. Serve with reserved mustard mixture.