Preheat your oven to 180 C / 350 F, line baking sheets with parchment paper or lightly greased foil.
In a mixing bowl, add the flour, cocoa, baking soda, and salt, whisk together.
In another mixing bowl, add the butter, sugar, brown sugar, eggs, and vanilla. Beat with an electric mixer until well mixed.
Add the flour mixture and use a sturdy spoon to mix together until well mixed. The dough will be very stiff, if too stiff, mix in 1 tablespoon of milk at a time, but keep the dough stiff.
Stir in the chips, pecans, and raisins.
Drop by very heaping tablespoons, 3 inches apart on the prepared baking sheets. Flatten dough slightly.
Bake for 12-14 minutes or until firm in the center. Cool on the sheets for 5 minutes then remove to a wire rack to cool completely.
Serve and enjoy.