Preheat oven to 350 degrees F. Line a large baking sheet with parchment paper and set aside.
In the bowl of a stand mixer, cream the butter, shortening and sugar until light and creamy, about 2 to 3 minutes.
Add the egg and vanilla and beat until combined, about 1 to 2 minutes.
In a small bowl, add and whisk the flour, baking powder, and kosher salt.
With the mixer on low, gradually add the dry ingredients to the wet ingredients. The dough should come together and be mixed in about 2 to 3 minutes. The dough will be thick.
With the mixer on low, add the whole Oreos a few at a time. The cookies should break into big and small pieces.
Using a large cookie scoop or ¼ cup measure, portion the dough into balls. Place on the prepared cookie sheet about 2 inches apart. Slightly flatten the dough with your fingers.
Bake for 10 to 14 minutes. The bottoms should be light brown and the centers barely set.
Remove the cookies from the oven. Place them on a wire cooling rack.
Serve warm or at room temperature.
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Notes
So the cookie dough comes together easily and completely, all the ingredients should be at room temperature.A hand mixer can be used to make the cookies. If one is used, crush the Oreos before adding them to the dough.For soft cookies that aren't hard and crumbly, bake them until the bottoms are just light brown and the centers are not quite set. The tops of the cookies shouldn't be brown at all. Immediately remove them from the baking sheet to cool.Nutritional information is an estimate and based on the ingredients and cooking methods used in this recipe.