I usually cook bonless chicken breasts in a pre-heated oven @ 350 for 30-35mins
350 for 1 hour is comon temperature. or 375 for 45 minutes.
45 mins to an hour for bone-in chicken (thighs,legs,breast) at 350 degrees ..either way,pierce it with a fork,if the juice comes out clear and NOT pink, it is cooked.
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Put it in a oven for about 375 degrees for about 40 minutes. When you cut into a piece if it isn't pink then its done. Also I cover it with a lid or foil when it's cooking to keep most of the juices...