This all depends. Chicken can actually be baked anywhere from 325 to 450 degrees F with varying results. Baking at a higher temperature will of course be faster, but runs the risk of drying out the chicken. A lower temperature has a much lower risk of drying out, but will take longer. Something to consider for this recipe is that you're also roasting the veggies, so I suggest a median temperature of around 390 degrees F so that everything is properly cooked just around the same time.