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