1In microwave, melt chocolate bits and p-nut butter, stir. Add crushed Oreo cookies to the chocolate/ p- nut butter mixture, stir. Spread, very, very thin onto a wax paper covered cookie sheet. Melt white chocolate in microwave. Spread onto the top of chocolate/p-nut butter, Oreo mixture. Marbleize using a knife. Chill until hardened.