Pre-heat your oven to 350F.
Grease and line a 9×9” baking pan.
In a medium bowl, melt butter and chocolate together, this can be done in the microwave at 30 second intervals.
In a separate bowl whisk flour, cocoa powder & salt.
Add sugar & vanilla to chocolate mixture and whisk until combined.
Add eggs one at a time whisking thoroughly in between each addition.
Add your dry ingredients and fold in until just combined.
Pour into your lined pan and bake in the oven for 25-28 minutes.
Let your brownies cool for at least 10 minutes in the pan, then remove & slice!