Preheat your oven to 350º.
Start by crushing your Oreos in a blender or food processor and sit aside.
Next, cream the butter, packed brown sugar, and granulated sugar in a stand mixer or with a hand mixer until combined.
Add in the egg, egg yolk, corn syrup, and vanilla extract and mix.
Once incorporated, add in the crushed Oreos, flour, cocoa powder, cornstarch, baking soda, and salt and mix until fully combined.
Take approximately 4 tbsp’s of dough and form into a ball. Place onto a cookie sheet (I use parchment paper.)
Using your palm, lightly flatten the cookies until they’re about half an inch thick.
If needed, cup your hands and round the edges of the cookies to ensure a round cookie once baked.
Be sure not to overcrowd the cookie sheet as these will expand while baking. I put 3 per row, 6 per tray, evenly spaced. This recipe will yield approximately 14 cookies. You can bake multiple batches as needed.
Bake cookies for approximately 8 minutes. All ovens bake differently so I’d suggest checking your cookies at the 6 minute mark. You’ll know they’re done baking once the top no longer looks “wet” and the edges will start to crack. Be sure not to overbake.
Remove from oven when done and let sit on cookie tray for at least 5-10 minutes before transferring to a cooling rack.