In a bowl, whisk together olive oil, red wine vinegar, Worcestershire sauce, garlic powder, paprika, coriander, salt, and black pepper.
Add chicken cubes to the marinade, cover, and refrigerate for 30 minutes to 2 hours.
If using wooden skewers, soak them in water for at least 30 minutes to prevent burning.
Preheat grill to medium-high heat.
Thread marinated chicken, onion, and bell peppers onto skewers.
Grill kabobs for 10-12 minutes, turning occasionally, until chicken is cooked through, has nice grill marks and the vegetables are tender.
Remove from grill, let rest briefly, and enjoy!