01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the flour, baking soda, baking powder, and salt. Set aside.
03 - In a large bowl, beat the butter, granulated sugar, and brown sugar together until light and creamy, about 2-3 minutes.
04 - Add the eggs one at a time, beating well after each addition. Mix in the vanilla extract.
05 - Gradually add the dry ingredients to the wet ingredients, mixing just until combined.
06 - Fold in the white chocolate and pistachios until evenly distributed.
07 - Scoop tablespoons of dough onto the prepared baking sheets, spacing them about 2 inches apart.
08 - Bake for 10-12 minutes, or until the edges are lightly golden but the centers are still soft.
09 - Cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.