Ok to cut into chicken while cooking to test for doneness?

[ChefJune]

Sure, you can cut into it if you don't care about keeping the juices inside. Maybe you need a new thermometer? I can't even imagine how dry and overcooked two completely defrosted chicken breasts would be after 1 hr. at 400 degrees!

My dad would have said, "It's already dead. You don't need to kill it again."

Personally, I would not roast chicken breasts that weren't on the whole bird. They cook so quickly that overcooking is always a danger.

 

[sparrowgrass]

What is the difference between cutting a little slit to look at doneness, and poking something 3 or 4 times with a thermometer? Use whatever works.