Preheat your oven to 325 degrees.
Add the butter to a medium saucepan and place it on the stove.
Turn the heat on low and stir occasionally until all the butter is melted.
Turn the heat off and remove the pan from the stove.
Whisk in the sugar, cocoa powder, salt, and vanilla extract.
Whisk in the eggs, one at a time, until throughly mixed in.
Stir in the flour until well blended and the batter is smooth, with no lumps.
Stir in the nuts, if you are using them. This step is optional. You can also sprinkle slivered almonds on top of the brownies instead of mixing them into the batter.
Pour the batter into a greased and floured 8" pan.
Bake for 20 to 25 minutes. These brownies taste best if slightly undercooked, rather than overcooked. You want the final product to be rich, moist, dense and chocolatey!
Remove the pan from the oven and place on a wire rack to cool.
Drizzle with chocolate syrup if desired. This step is optional.
Cut the brownies into 16 pieces and enjoy!
I also like to use these dark chocolate brownies as the first layer of a brownie ice cream sundae.