Finally, perhaps the best way to tell if your brownies are done is to use an instant-read thermometer. This will help you tell if your brownies are fully baked or if they are still raw in the center.
The Most Accurate Tip: Use Food Thermometer
To use an instant-read thermometer, insert your gage into the middle of your brownies. Make sure it goes down far enough to get an accurate read.
Your internal temperature must be at least 165°F but should be within the range listed below for your specific kinds of brownies.
Cake like: 210℉ (99℃)
Chewy: between 165 and 210°F
Fudgy: Between 180℉ (82℃)190 to 190℉ (88℃)