01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper to prevent sticking and ensure easy cleanup.
02 - In a medium bowl, whisk together the flour, baking soda, baking powder, and salt until well blended. Set aside for later use.
03 - In a large bowl, beat the softened butter, granulated sugar, and brown sugar together using an electric mixer until the mixture becomes light and creamy, approximately 2-3 minutes.
04 - Add the eggs one at a time, beating thoroughly after each addition. Mix in the vanilla extract until fully incorporated.
05 - Gradually add the dry ingredient mixture to the wet ingredients, mixing just until combined. Avoid overmixing to prevent tough cookies.
06 - Gently fold in the white chocolate chips and chopped pistachios until evenly distributed throughout the dough.
07 - Drop rounded tablespoons of dough onto the prepared baking sheets, leaving approximately 2 inches of space between each cookie to allow for spreading.
08 - Bake for 10-12 minutes, or until the edges are lightly golden while the centers remain slightly soft for optimal chewiness.
09 - Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.