Now, I know what you're thinking, "how do I check the temperature without butchering the poor turkey?" Fear not, friend, because it's easier than solving a rubix cube. You can use a food thermometer to check the internal temperature of the turkey breast. Just insert the thermometer into the thickest part of the breast, and voila! You'll have your answer in no time.
Boneless Turkey Breast Internal Temp at Benjamin Ferguson blog
And, if you're feeling extra fancy, you can even use a probe thermometer that'll give you a reading in just a few seconds. It's like having your own personal temperature butler - how cool is that? Just remember, the key is to be patient and not to rush the cooking process.