The easiest way to tell if your brownies are baked enough is to use an instant-read thermometer. They need to be at a minimum of 165 degrees in the middle to be safe to eat. They will still be very gooey at this temp so aim for about 180-190 for that perfect fudgy brownie. You can also try inserting a toothpick but know that you don't want a clean toothpick to come out of them. They will be over-baked if you reach this point.