Toss vegetables with olive oil, cumin, coriander, salt and pepper, and pour onto baking sheet lined with parchment paper or foil.
Liberally coat chicken breast filets with harissa paste (If your harissa paste is very thick, you can thin it out with a bit of water or lemon juice.) and nestle on top of the vegetable mixture.
Place chicken and vegetables in oven and roast for 15-20 minutes, or until chicken is heated through and well-browned, and vegetables are cooked and crisp-tender.