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 maximum flavor penetration.
03 - Preheat grill to medium-high heat (about 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 alternately onto skewers, distributing ingredients evenly across each skewer.
05 - Place kabobs on the preheated grill and cook for 12–15 minutes, turning every 3–4 minutes and basting with additional BBQ sauce, until chicken is cooked through (internal temperature of 165°F) and vegetables are lightly charred and tender.
06 - Remove kabobs from the grill and let rest for a few minutes before serving hot.