Butter or spray with cooking oil a 9x13 dish and pre-heat oven to 350 degrees.
In a large bowl, mix together melted butter and granulated sugar until well blended.
Stir in eggs and vanilla.
Add in flour, cocoa powder, and salt and mix until just combined, taking care not to over-mix.
Pour batter into prepared pan and bake for 24-27 minutes, until a toothpick inserted into brownies comes out clean.
Place pan on wired rack and let cool to room temperature.