01 - In a large bowl, whisk together the BBQ sauce, olive oil, soy sauce, minced garlic, smoked paprika, salt, and pepper until well combined.
02 - Add the chicken cubes to the marinade, tossing to coat evenly. Cover 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 the marinated chicken, pineapple chunks, bell pepper pieces, and red onion wedges alternately onto the skewers, distributing ingredients evenly.
05 - Place the skewers on the grill and cook for 12 to 15 minutes, turning every 3 to 4 minutes and basting with additional BBQ sauce, until the chicken is cooked through (internal temperature of 165°F) and the vegetables are lightly charred and tender.
06 - Remove the kabobs from the grill and let rest for a few minutes before serving hot.