Whenever I cook chicken it ends up rubbery and tough

chicken is very dry to begin with. Yes defrost in the fridge and then make them a different way....when you roast chicken that has no skin on them it makes them dry and rubbery.... I would bread and fry them or bread and bake in oven. You can do other stuff with them as well but just remember that you should put something on them in order to prevent them from drying out....also I was looking at that temperature and time and that just sounds wrong! if you bread them and want to put them in the oven do 350 degrees for about 25 minutes.