Preheat the oven to 162 degree celsius

Line you 8 by 8 inches or 9 by 13 inches pan which baking paper(this helps your cake easier to remove after baking)

Place the Sugar, Butter,unsweetened cocoa and salt in a large microwave safe bowl and microwave for a minute or use a double boiler and heat till butter melts the bring down.

Stir the the mixture until all is completely combined

Allow to cool, then add the egg one at a time to the mixture.

Stir in the flour

Stir in the vanilla extract

Transfer the batter into the prepared pan.

Bake for 50 mins or until a tooth pick comes out clean.

Allow to cool completely, then transfer to plate