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Preheat oven to 450 degrees F (230 degrees C) and cook whole (thawed) chicken for 10-15 minutes. Then reduce the temperature to 350 degrees F (175 degrees C) and roast for 20 minutes per pound. (Do not add the extra 15 minutes to the cooking time as with the regular method.)
Quick Answer. The length of time it takes to cook a boneless chicken breast depends on the method of preparation, oven temperature and the size of the breast. For instance, a 4-ounce boneless chicken breast baked at 350 degrees Fahrenheit should be cooked for 20 to 30 minutes. The chicken should reach an internal temperature of 165 degrees Fahrenheit.