Preheat your oven to 350°F (175°C) to ensure even baking and perfect chewiness.
Line a 9x13 inch baking pan with parchment paper, leaving some overhang for easy removal of the bars.
In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar using an electric mixer until light and fluffy, about 2-3 minutes.
Beat in the eggs one at a time until fully incorporated, then stir in the vanilla extract until combined.
In another bowl, whisk together the all-purpose flour, baking soda, and salt. Gradually add this dry mixture to the wet ingredients, mixing just until combined. Avoid over-mixing.
Using a spatula, gently fold in the chopped Oreo cookies and white chocolate chips until evenly distributed throughout the dough.
Pour the batter into the prepared baking pan and spread evenly with the spatula.
Bake for 25-30 minutes, or until edges are golden brown and a toothpick inserted in the center comes out clean. The center may appear slightly undercooked but will set as it cools.
Allow the bars to cool in the pan for about 15 minutes. Use the parchment paper overhang to lift them out, then transfer to a wire rack to cool completely before cutting into squares.