Insert a toothpick in the center of the pan. If it comes out with a wet crumb (not a wet batter), that's perfect for a fudgy brownie. You can also use a food thermometer to check the internal temperature (make sure the thermometer doesn't touch the bottom of the pan). A fudgy brownie will usually read 165 degrees Fahrenheit to 185 degrees Fahrenheit. This recipe comes out perfectly fudgy and chewy at around 210 degrees Fahrenheit.