In a standing mixer, combine the melted butter, sugar and vanilla extract and mix until combined
Add the eggs and mix until well combined.
In a medium bowl combine the flour, cocoa, baking powder and salt.
Slowly add dry ingredients to the egg mixture and mix until well combined.
Pour the batter into the pan
Bake for about 22-26 minutes or until a toothpick comes out clean.
Allow brownie to sit for 3-5 minutes, then remove to a cooling rack to finish cooling.