Butterball recommends unwrapping its fully cooked turkey breast and placing it in a shallow baking pan in an oven that has been preheated to 350 degrees Fahrenheit. The turkey breast should be allowed to cook for up to a half an hour, or until it reaches the desired temperature.
If you are heating a fully cooked turkey breast in the microwave, slice the meat and arrange the slices into a single layer on a microwave-safe plate. Heat the slices for 30 seconds to one minute, or until they are hot enough.
A fully cooked turkey breast should be used no later than five days after its sell-by date. After opening a pre-packaged fully cooked turkey breast, the meat should be used within three days.