01 - Combine olive oil, lemon juice, minced garlic, dried oregano, paprika, salt, and black pepper in a large mixing bowl. Whisk thoroughly until emulsified.
02 - Add chicken cubes to marinade mixture. Toss to coat evenly, cover with plastic wrap, and refrigerate for a minimum of 30 minutes or up to 2 hours for optimum flavor.
03 - Preheat grill to medium-high heat, approximately 400°F.
04 - Alternately thread marinated chicken pieces, red bell pepper, yellow bell pepper, red onion, and zucchini onto skewers, distributing ingredients evenly.
05 - Place assembled skewers on grill grates. Cook for 12 to 15 minutes, turning occasionally, until chicken is fully cooked and vegetables have developed light char marks.
06 - Remove kabobs from grill and let rest for 2 minutes prior to serving.