Preheat the oven to 425°F (220°C) for roasting the vegetables.
In a small bowl, mix together ground cumin, ground sumac, garlic powder, a pinch of salt, and pepper.
Rub the chicken breast with the spice mixture, ensuring an even coating on both sides.
Place the chicken on a baking sheet lined with parchment paper and roast in the oven for 20-25 minutes or until cooked through.
Meanwhile, dice the red bell pepper, zucchini, and red onion. Toss them with olive oil, a pinch of salt, and pepper.
Spread the vegetables on a separate baking sheet and roast in the oven for about 15-20 minutes until tender and slightly caramelized.
Prepare the quinoa according to package instructions if not already cooked.
Slice the roasted chicken breast and arrange over a bowl of quinoa. Top with the roasted vegetables.
Drizzle any remaining juices from the chicken or vegetables over the bowl for extra flavor, and serve warm.