01 - In a large mixing bowl, whisk together olive oil, lemon juice, minced garlic, dried oregano, smoked paprika, ground cumin, salt, and black pepper until well combined.
02 - Add chicken pieces to the bowl with marinade and toss to evenly coat. Cover and refrigerate for at least 30 minutes, or up to 2 hours for a more pronounced flavor.
03 - Preheat the grill or grill pan to medium-high heat. If using wooden skewers, soak them in water for 20 minutes to prevent burning.
04 - Alternately thread marinated chicken, bell peppers, red onion, and zucchini onto skewers, arranging for even cooking and attractive presentation.
05 - Place assembled skewers on the preheated grill and cook for 12 to 15 minutes, turning every 3 to 4 minutes, until the chicken is fully cooked and slightly charred at the edges.
06 - Transfer kabobs from the grill and allow to rest for 5 minutes. Garnish with chopped parsley and lemon wedges as desired. Serve immediately while hot.