01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium saucepan over medium heat, melt the butter. Continue to cook, swirling often, until the butter foams and turns golden brown with a nutty aroma (about 4–5 minutes). Remove from heat and let cool for 10 minutes.
03 - In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.
04 - In a large mixing bowl, combine the brown butter, brown sugar, and granulated sugar. Beat until well blended.
05 - Add eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
06 - Gradually add the dry ingredients to the wet mixture, mixing just until incorporated.
07 - Fold in the chopped pistachios and chocolate chips.
08 - Scoop dough by rounded tablespoons onto the prepared baking sheets, spacing about 2 inches apart.
09 - Bake for 10–12 minutes, or until the edges are golden and centers are still slightly soft.
10 - Cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.