01 - In a large bowl, whisk together BBQ sauce, olive oil, soy sauce, minced garlic, smoked paprika, salt, and pepper until well combined.
02 - Add chicken cubes to the marinade and toss thoroughly to coat all pieces evenly. Cover the bowl and refrigerate for at least 30 minutes, or up to 2 hours for deeper flavor penetration.
03 - Preheat the grill to medium-high heat (approximately 400°F). If using wooden skewers, soak them in water for at least 20 minutes to prevent burning.
04 - Thread marinated chicken, pineapple chunks, bell pepper pieces, and red onion onto skewers in an alternating pattern, distributing ingredients evenly across each skewer.
05 - Place kabobs on the preheated grill and cook for 12 to 15 minutes, rotating every 3 to 4 minutes and basting with additional BBQ sauce. Cook until chicken reaches an internal temperature of 165°F and vegetables are charred and tender.
06 - Remove kabobs from the grill and allow them to rest for a few minutes before serving hot.