01 - Preheat your oven to 425°F. Line a large sheet pan with parchment paper or foil for easy cleanup.
02 - In a large bowl, combine chicken, bell peppers, red onion, olive oil, garlic powder, smoked paprika, oregano, cumin, salt, and black pepper. Toss until well coated.
03 - Spread the chicken and vegetable mixture evenly on the prepared sheet pan.
04 - Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and vegetables are tender and slightly charred.
05 - While the chicken cooks, prepare the slaw: In a large mixing bowl, combine cabbage, carrots, parsley, dill, and chives. In a small bowl, whisk together ranch dressing and lemon juice. Pour dressing over the slaw, toss to coat, and season with salt and pepper to taste.
06 - Warm the pita breads according to package instructions or directly on an open flame for a few seconds.
07 - To assemble, fill each pita with roasted chicken and vegetables, top generously with fresh herb ranch slaw, and sprinkle with feta cheese if using. Serve with lemon wedges.