01 - In a large mixing bowl, whisk together the 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 all pieces evenly. Cover the bowl and refrigerate for at least 30 minutes, or up to 2 hours for deeper flavor penetration.
03 - Preheat your grill to medium-high heat, targeting approximately 400°F. Clean and lightly oil the grates to prevent sticking.
04 - Thread the marinated chicken cubes onto skewers, alternating with red bell pepper, yellow bell pepper, red onion wedges, and zucchini rounds. Distribute ingredients evenly across all skewers.
05 - Place the assembled skewers on the preheated grill. 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 to allow the juices to redistribute before serving.