In a large mixing bowl, cream together the butter, brown sugar, and granulated sugar until light and smooth. Add the eggs, vanilla extract, and instant pistachio pudding mix. Mix until fully combined and evenly incorporated.
Step 3: Add the Dry Ingredients
In a separate bowl, whisk together the flour, baking soda, and salt. Gradually add the dry ingredients to the wet mixture, stirring gently until a thick dough forms and no dry flour remains.
Kitchen Tip: Avoid overmixing once the flour is added. Excess mixing develops gluten, which can make the blondies tough rather than soft and fudgy.
Step 4: Fold in the Mix-Ins
Add the chopped pistachios and white chocolate chips to the dough. Fold gently with a rubber spatula until evenly distributed throughout the mixture.
Step 5: Bake
Spread the dough evenly into the prepared baking dish, smoothing the surface with a spatula. Bake for 25 to 28 minutes, or until the edges are lightly golden and a toothpick inserted into the center comes out clean or with a few moist crumbs.
Step 6: Cool and Slice
Remove the pan from the oven and place it on a wire rack. Allow the blondies to cool completely, about 30 minutes, before cutting into squares. This cooling time helps the bars set properly and develop their signature fudgy texture.
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