In a large bowl, combine the oil, vinegar, parsley, onion powder, paprika, salt, and black pepper
Add the remaining ingredients and toss to coat
Cover and refrigerate for 2 hours
Remove the chicken and vegetables from the marinade, discarding excess marinade, and thread the chicken and vegetables evenly on the skewers
If using bamboo skewers, they must first be soaked in water for 15-20 minutes
Preheat the grill to medium-high heat
Place the kabobs across the grill rack and cook for 6-8 minutes or until the chicken is cooked and no pink remains, turning halfway through