Beat butter and both sugars.

Add the egg and vanilla.

Add flour, cocoa, baking sode, salt, flour to make a dough.

Stir in 6 chopped Oreos.

Press half into a 9x9 pan lined with nonstick foil.

Chop 6 more oreos and lay on top.

Pour on the condensed milk.

Press on the rest of the dough carefully to seal in the condensed milk.

Chop the remaining 6 oreos and sprinkle on top.

Bake at 350 for about 25 minutes.

Cool before cutting into bars.

Drizzle with peanut butter sauce if desired.