Step 1: Preheat the Oven

1. Preheat your oven to 350°F (175°C). Grease and line a 9×13-inch baking dish with parchment paper, leaving some overhang for easy removal.

Step 2: Make the Cookie Base

1. In a large mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
2. Beat in the eggs one at a time, followed by the vanilla extract, mixing until well combined.
3. In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet mixture, mixing until just combined.
4. Gently fold in the chopped pistachios until evenly distributed throughout the dough.

Step 3: Bake the Cookie Bars

1. Spread the cookie dough evenly into the prepared baking dish, smoothing the top.
2. Bake in the preheated oven for 25–30 minutes, or until the edges are lightly golden and a toothpick inserted in the center comes out clean.
3. Remove from the oven and let cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely.

Step 4: Add the Topping

1. Once the bars are cool, melt the white chocolate chips in a microwave-safe bowl in 30-second intervals, stirring until smooth.
2. Pour the melted white chocolate over the cooled cookie bars, spreading it evenly with a spatula.
3. Sprinkle the additional chopped pistachios on top of the white chocolate while it’s still warm.

Step 5: Slice and Serve

1. Allow the topping to set for about 30 minutes, then slice the bars into squares.
2. Serve and enjoy your Pistachio Dream Cookie Bars.