Preheat oven to 350 degrees. Place parchment paper in the bottom of a 9×13-inch baking pan and grease the sides (I like to spray the bottom and sides with cooking spray)..
In a medium bowl, whisk together the flour, baking soda, and salt. Set aside..
In a large bowl, beat melted butter and sugars together until creamy, about 3-4 minutes. Mix in eggs and vanilla extract. Add flour mixture until combined. Stir in white chips and pistachios..
Spread dough evenly in the prepared pan. Bake for 25-30 minutes, or until the top is slightly golden..
Remove from oven and let cool for about 15 minutes, then transfer to cooling rack to cool completely. Remove from the pan and cut into 24 squares.