Preheat your oven to 425°F. Line a baking sheet with parchment paper.
In a small bowl, combine the shawarma spice mix with lemon juice, reserving a little for drizzling later.
Place the chicken breast on a cutting board and rub both sides with the spice blend. Let it marinate briefly while you prep the vegetables.
Slice the red bell pepper into strips, cut the zucchini into half-moons, and thinly slice the red onion.
Toss the vegetables in olive oil, and season lightly with salt and pepper. Spread them out on the prepared baking sheet.
Place the seasoned chicken breast on the same baking sheet, nestling among the vegetables.
Roast in the oven for 20-25 minutes, or until the chicken is cooked through and the vegetables are tender and slightly charred.
While the chicken and vegetables are roasting, prepare 1/4 cup of cooked quinoa if not already done.
Slice the chicken into strips once rested for a few minutes after baking.
Assemble the bowl by layering quinoa at the base, topping with roasted vegetables and sliced chicken. Drizzle a little extra lemon juice over the top and garnish with fresh parsley.
Serve warm and enjoy your herb-spiced chicken shawarma bowl.