Double boil chocolate and butter.

In a mixing bowl,add granulated sugar, brown sugar and egg.Mix till it becomes creamy.

And add vanilla extract, salt and melted chocolate. Mix everything together.

Now add cocoa powder and all purpose flour. Mix dry ingredients into wet ingredients.

Line up the baking tray with parchment paper and pour the batter.

Bake for 35 minutes in 180 degree C.

Once it's baked, allow it to cool down completely and cut into pieces.