01 - In a large mixing bowl, whisk together olive oil, lemon juice, minced garlic, dried oregano, paprika, salt, and black pepper until fully emulsified.
02 - Add the cubed chicken to the marinade, ensuring all pieces are evenly coated. Cover and refrigerate for minimum 30 minutes, up to 2 hours for optimal flavor development.
03 - Heat grill to medium-high (approximately 400°F) and lightly oil the grates to prevent sticking.
04 - Alternately thread marinated chicken, red bell pepper, yellow bell pepper, red onion, and zucchini onto metal or wooden skewers, distributing ingredients evenly for consistent grilling.
05 - Arrange skewers on the preheated grill. Cook for 12 to 15 minutes, turning every few minutes, until chicken is fully cooked (internal temperature reaches 165°F) and vegetables are lightly charred.
06 - Remove kabobs from grill and allow to rest for 2 minutes before serving to retain juices.