In a zip-lock bag, place all prepared veggies. Add olive oil & close bag. Carefully toss veggies. When chicken has been roasting for about 3/4 of an hour, remove from oven & add the veggies to the sheet pan & sprinkle with salt & pepper. Continue to roast until chicken is cooked & veggies are tender crisp. While chicken & veggies are roasting, prepare couscous.