Preheat your oven to 350 with a 12-inch skillet. Allow your skillet to preheat.
Melt your butter. In a large bowl whisk together sugar, cocoa powder, and salt. Pour in the butter and stir until just combined.
Add the eggs and vanilla extract. Whisk again.
Add the flour and whisk or fold with a rubber spatula until just combined. Do not over mix your batter and try to avoid creating bubbles.
Pour the batter into your preheated skillet and place back into the oven at 350F for 30 minutes. The top should be set but with a thin crust. It should have a bit of give as the brownies will not be completely cooked through yet. The brownies will continue to cook a bit after being pulled out. Allow them to cool completely (about an hour) before cutting.
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