In a large bowl, beat the softened butter, brown sugar, and granulated sugar until light and fluffy.
Add the egg yolk and vanilla extract, then mix until fully combined.
In a separate bowl, whisk together the flour, baking soda, and salt.
Gradually add the dry ingredients to the wet ingredients and mix until no streaks of flour remain. Do not overmix.
Fold in the white chocolate chips, chocolate chips, and chopped Oreo cookies until evenly distributed.
Scoop the cookie dough onto the prepared baking sheet, leaving about 2 inches between each cookie.
Flatten the top slightly. Press the larger Oreo chunks on top of each cookie dough ball.
Bake at 350F for 10–13 minutes, or until the edges are set and lightly golden while the centers still look slightly underbaked.
Let the cookies cool on the baking sheet for 5–10 minutes before transferring them to a wire rack to cool completely.