If you stuff your turkey (which is totally fine, by the way), the stuffing also needs to hit 165°F. But here’s the catch: the stuffing is deep inside the cavity, insulated by meat. It takes forever to heat up.
By the time the stuffing is safe, your breast might be toast. So most pros cook stuffing separately in a baking dish. It’s less stressful, and you get crispy edges. Trust me, your guests will love the crunchy bits.
If you go for the stuff-it-all approach, be patient. Temp the stuffing in the center, and don’t rush it. You’re basically slow-cooking a mini loaf inside a big bird.