Preheat the oven to 350°F. Spray an 9×13-inch baking pan with cooking spray or line with parchment paper

On medium speed in a stand mixer or with a hand mixer, cream the butter, peanut butter and sugars for 2 minutes until fluffy

Add in the eggs and vanilla extract and mix on medium for 1 more minute

Add in the flour and salt and mix on low until just combined (~20 seconds)

Pour the batter into the prepared pan and smooth with a spatula to form an even layer

Break up some of the oreos into halves while leaving some whole (we prefer them not to all be the same size/shape). Place the oreos on top and press in slightly

Bake for 25-30 minutes until the center is no longer jiggly but soft (note this bake time is for a 9×13 inch metal pan – if using a glass pan or smaller pan, the time will need to be increased)

Let cool for ~1 hour before cutting