01 - In a large mixing 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 and toss to coat evenly. Cover the bowl with plastic wrap and refrigerate for at least 30 minutes, or up to 2 hours for deeper flavor penetration.
03 - Preheat an outdoor grill or grill pan to medium-high heat, approximately 400°F. If using wooden skewers, submerge 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 the ingredients evenly across each skewer.
05 - Place the skewers on the preheated grill and cook for 12 to 15 minutes, rotating every 3 to 4 minutes and basting generously with additional BBQ sauce, until the chicken reaches an internal temperature of 165°F and the vegetables show light char marks.
06 - Remove the kabobs from the grill and allow them to rest for 3 to 5 minutes before serving to let the juices redistribute. Serve hot.