01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the flour, cocoa powder, baking soda, and salt. Set aside.
03 - In a large bowl, beat the butter, brown sugar, and granulated sugar together until light and creamy, about 2-3 minutes.
04 - Add the egg, egg yolk, vanilla extract, milk, and red food coloring. Mix until well combined.
05 - Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
06 - Fold in the white chocolate chips and chopped Oreo cookies.
07 - Using a medium cookie scoop or tablespoon, drop rounded balls of dough onto the prepared baking sheets, spacing about 2 inches apart.
08 - Bake for 10-12 minutes, or until the edges are set and the centers look slightly underbaked.
09 - Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.