Preheat the oven to 350°F (175°C).
Lightly spray the bottom of a baking pan with non-stick cooking spray, then line it with parchment paper, ensuring there’s an overhang on all sides.
In a large bowl, whisk together the melted butter, brown sugar, and white sugar until the mixture is smooth and the butter is fully incorporated, about 1 minute, with no visible pools of melted butter.
Add the egg, egg yolk, and vanilla extract, whisking until combined.
Carefully fold in the flour and salt, mixing until just combined.
Gently stir in the white chocolate chips.
Spoon half of the batter into the prepared pan and spread it evenly to cover the bottom.
Place a layer of Golden Oreos on top, arranging 4 rows of 4 cookies.
Spoon the remaining batter over the Oreos and gently spread it to cover.
Bake in the preheated oven for 30-35 minutes, or until the top is set, the sides begin to pull away from the pan, and a toothpick inserted into the center comes out clean or with a few moist crumbs. Bake time may vary based on your oven and how gooey you prefer your blondies.
Allow the bars to cool completely in the pan for about 4 hours. Then, lift them out of the pan using the parchment paper overhang. Transfer to a cutting board and cut into squares using a large, sharp knife.