Preheat your oven to 180 C/ 350 F. Line a 8 inch square pan with parchment or foil, leaving it long enough on two oposite sides to lift out the baked brownies.
Melt the butter in a saucepan on the stovetop or in the microave.
Whisk in the sugar well.
Whisk in the eggs , one by one .
Whisk in the vanilla extract.
Sift in the cocoa , flour and salt. Whisk until incorporated.
Pour into the prepared pan and bake for 22- 24 minutes until a toothpick inserted in the centre comes out with few moist crumbs.
Cool completely in pan , remove and slice.
Notes
These last for upto 5 days in an airtight container. These aren't very sweet. You can increase the sugar by upto quarter cup , or you could omit the coffee. You can add in chopped nuts or chocolate chips if you wish.