Step 1: Preheat and Prepare

First, preheat your oven to 350°F (175°C). Grease a baking pan and line it with parchment paper to ensure easy removal of the bars once they are baked.

Step 2: Mix Wet Ingredients

In a large mixing bowl, combine the melted salted butter, granulated sugar, and brown sugar. Use a whisk to mix until well combined. The mixture should be smooth and creamy, with no lumps of sugar.

Step 3: Combine Dry Ingredients

In a separate bowl, sift together the all-purpose flour and baking soda. This step is crucial as it helps to evenly distribute the baking soda throughout the flour, ensuring that the bars rise properly during baking.

Step 4: Incorporate Oreos and White Chocolate

Add the dry ingredients to the wet mixture gradually, folding them in with a spatula until just combined. Be careful not to overmix, as this can result in tough bars. Gently fold in the white chocolate chips and crushed Oreo pieces until they are evenly distributed throughout the batter.

Step 5: Bake to Perfection

Pour the batter into the prepared baking pan, spreading it out evenly with a spatula. Sprinkle the remaining crushed Oreo pieces on top. Bake in the preheated oven for 35 minutes or until a toothpick inserted into the center comes out clean. The bars should be golden brown on top and firm to the touch.

Step 6: Cool and Slice

Allow the bars to cool in the pan for 10-15 minutes before transferring them to a wire rack to cool completely. Once they are fully cooled, slice the bars into individual servings.