Preheat your oven to 425°F.
In a small bowl, combine the herb spice blend ingredients (cumin, paprika, turmeric, garlic powder, salt, and pepper).
Lightly coat the chicken breast with the spice blend, ensuring it's evenly covered.
Place the spiced chicken on a baking sheet and roast in the preheated oven for about 20-25 minutes, or until fully cooked.
Meanwhile, chop bell pepper, zucchini, and red onion into bite-sized pieces. Toss with olive oil, a pinch of the remaining spice blend, salt, and pepper.
Spread the vegetables on a separate baking sheet and roast for about 15-20 minutes until tender and slightly caramelized.
Prepare quinoa as per package instructions if not already cooked, ensuring a light, fluffy texture.
Assemble the bowl by layering cooked quinoa, topped with roasted vegetables and sliced herb-spiced chicken.
Serve warm and enjoy your nutritious, flavor-packed shawarma bowl.