This is my favorite method to cook chicken if I am going to be using it for something else, like in a salad, or for enchiladas, whatever I am making this is how I like to cook it.
Cover a sheet pan with foil. Put a cooling rack (like you use to cool cookies) on top of the foil. Give it a quick spray with cooking spray.
Put the chicken on the rack. I usually drizzle olive oil and salt and pepper on it if it has not be marinated. The chicken in the pictures has been. Put the chicken in a hot, 400 degree oven. Cook for about 20 minutes. You can tell that it is done when the chicken has very little give when touched. It should feel like the top of your nose. Weird I know, but that is the best method that I know to explain when something is done.
I usually also always cook more chicken than I need and use it for something else. It is nice to have cooked chicken around to add to a salad, or a sandwich, or pasta.