How will baking chicken at a high heat differ from a lower heat?
It is possible to cook chicken at 450 degrees. I have a recipe that cooks 1/2 inch thick chicken cutlets at 500 degrees for 8 minutes , so at 450 I would cook them for 10-12 minutes, or 15-20 for full-thickness chicken breast. This high-heat method can actually keep your chicken moister than a lower-heat method, and will work with your French fries, so maybe find a recipe that cooks at 450 degrees. There are many available if you google "chicken breast 450."