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 chicken cubes to the marinade and toss to coat evenly. Cover and refrigerate for at least 30 minutes, or up to 2 hours for deeper flavor.
03 - Preheat grill to medium-high heat, approximately 400°F.
04 - Thread marinated chicken pieces alternately with red bell pepper, yellow bell pepper, red onion wedges, and zucchini rounds onto skewers.
05 - Place kabobs on the grill and cook, turning occasionally, for 12 to 15 minutes until the chicken is cooked through and vegetables are lightly charred.
06 - Remove kabobs from the grill and let rest for 2 minutes before serving.