Preheat oven to 350°F and line a baking sheet with parchment paper.
Whisk melted butter, brown sugar, and granulated sugar until smooth.
Stir in egg yolk, vanilla extract, and red food coloring until combined.
Fold in flour, cocoa powder, baking powder, cornstarch, and salt.
Gently fold in Oreos and chocolate chips.
Divide dough into two balls, flatten slightly, and freeze for 10 minutes.
Bake for 10–12 minutes until edges are set and centers are soft.
Cool for 5 minutes before enjoying.