Cream the butter, shortening and sugars together until fluffy, about 2 minutes. Add the eggs and vanilla, beating until well blended. In a separate bowl whisk together the flour, cocoa powder, baking soda and salt. Gradually add this to the butter, mix until fully incorporated. Using a spatula fold in the Oreo's, chocolate chips, and cookies n' cream bar. It is very thick, don't worry! Chill the dough for 30 minutes before baking.