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