Preheat oven to 350 degrees. Line cookie sheets with parchment.
Beat butter and both sugars until well blended.
Add in vanilla, egg and yolk until light and creamy.
Add in flour, salt and baking soda just until incorporated.
Stir in chocolate chunks by hand.
Take a large amount of dough...just enough to encase/cover an Oreo and flatten it a bit.
Bake 12-14 minutes and cool.