01 - In a large bowl, whisk together olive oil, lemon juice, minced garlic, dried oregano, paprika, salt, and black pepper until well combined.
02 - Add the chicken cubes to the marinade and toss thoroughly to coat evenly. Cover the bowl and refrigerate for at least 30 minutes, or up to 2 hours for deeper flavor penetration.
03 - Preheat grill to medium-high heat, approximately 400°F. Clean and lightly oil the grates to prevent sticking.
04 - Thread the marinated chicken pieces alternately with red bell pepper, yellow bell pepper, red onion wedges, and zucchini rounds onto the skewers, distributing ingredients evenly.
05 - Place the skewers on the preheated grill and cook for 12 to 15 minutes, turning occasionally with tongs, until the chicken is cooked through to an internal temperature of 165°F and the vegetables are lightly charred.
06 - Remove the kabobs from the grill and let them rest for 2 minutes before serving to allow the juices to redistribute.