How do I bake chicken breast?
The exact time and temperature will depend on the size of the breasts and your oven. You should always use a meat thermometer to verify that the chicken is cooked all the way through. For breasts, you want to make sure they're around 160 F on the inside (they're actually safe to eat a bit earlier, but 160 F leaves you with a margin of error). If you don't have a meat thermometer, you'll need to cut them open to make sure they're not pink on the inside, and the juices run clear.

I'd start the oven at about 375 F, and start checking on them after about 30 mins.