Preheat the oven to 350°F (180°C). Line two baking sheets with parchment paper and set aside.
In a medium-sized mixing bowl, whisk the flour*, salt, baking soda, and cornstarch.
In a large mixing bowl, add the butter, brown sugar, and granulated sugar. Beat until light and fluffy, 1-2 minutes. Add the milk, vanilla, peppermint extract and food coloring and beat until smooth and creamy.
Add the flour mixture to the wet mixture and mix until just combined.
Fold in the chocolate chips and Oreo chunks.
Using a cookie scooper, place ~3 tbsp (44 g) balls of dough on the prepared baking sheets, leaving room in between for spreading. Top each with more chocolate chips and Oreo chunks.
Bake in the preheated oven for 11-13 minutes. They may look slightly underbaked, but will set as they cool - you don't want to overbake them.
Allow to cool on the baking sheets then enjoy!