01 - Whisk together olive oil, lemon juice, garlic, oregano, paprika, salt, and pepper in a large bowl until well combined.
02 - Add chicken pieces to the marinade, stirring to coat thoroughly. Cover and refrigerate for at least 20 minutes, or up to 2 hours for enhanced flavor.
03 - Heat grill to medium-high temperature, approximately 400°F.
04 - Thread chicken, peppers, onions, zucchini, and mushrooms onto skewers, alternating ingredients for even cooking and visual appeal.
05 - Lightly brush assembled kabobs with any remaining marinade.
06 - Grill kabobs for 12-15 minutes, turning every 3-4 minutes, until chicken reaches internal temperature of 165°F and vegetables are tender with light char marks.
07 - Remove from grill and let rest for 2 minutes. Garnish with fresh parsley and accompany with lemon wedges if desired.