In a well prepared 8inch cake pan, place half of your cookie dough. Press down so that it is a flat layer.
Starting in the center, place Oreo's flat on top of cookie dough. Press down remaining cookie dough over Oreo layer.
In an oven heated to 350, bake for 25-35 minutes. At 25 min. I placed an aluminum foil ring around the edge of the pan so the cookie edges would not burn, and then watched closely.
Remove from oven when center is no longer shiny.
Let cool and cover in buttercream.