In a medium bowl, whisk together flour, cornstarch, and salt until evenly combined.

In a large mixing bowl, beat the butter, granulated sugar, and brown sugar until creamy and fluffy.

Add in the eggs and vanilla extract, mixing until well incorporated.

Gradually add the dry mixture to the wet mixture, stirring gently until a firm dough forms.

Fold in chocolate chips and chopped Oreos until evenly distributed.

Preheat the oven to 350°F (175°C) and prepare a baking sheet.

Portion the dough onto the baking sheet and bake for 11-12 minutes until edges are golden.

Allow cookies to cool on the tray for 10 minutes before transferring to a wire rack.