Preheat oven to 350 Degree F (170 degree C) and grease eight inch pan, or line it with parchment paper.
In a bowl, whisk the flour, cocoa powder and salt.
In another larger bowl, mix butter with chocolate over a double boiler until melted and smooth. Add Sugar and stir constantly until it dissolves.
Add 3 eggs first once the mixture turns at the room temperature and mix well. Add another 2 with Vanilla extract.
Lightly add dry ingredients to the chocolaty mixture and mix until just combined. Do not overmix.
Pour the batter into prepared pan and top it with Walnuts and Chocolate Chips.
Bake for about 30 minutes or until toothpick comes out clean.
Let them cool completely before cutting into bars.