Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, baking soda, and salt.
In a large bowl, mix the tahini, brown sugar, and granulated sugar until well combined.
Add the egg and vanilla extract, mixing until smooth.
Gradually add the dry ingredients to the wet ingredients, stirring until just combined.
Fold in the dark chocolate chips and chopped pistachios.
Using a tablespoon, scoop the dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake for 10-12 minutes or until the edges are lightly golden.
Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.