Pulse the Oreos in a food processor until fine crumbs. If using melted butter, combine it with crumbs and mix. Spread one-third of the mixture in a 9x13 inch pan, pressing firmly.

Mix cream cheese, vanilla pudding, and peanut butter until smooth. Gradually add milk while mixing. Spread over the Oreo crust.

Sprinkle the remaining Oreo crumbs over the peanut butter layer and press gently.

Beat cream cheese until fluffy, then add chocolate pudding mix and melted chocolate with milk. Mix until creamy, then spread over the Oreo crumbs.

Sprinkle the remaining Oreo mixture on top of the chocolate layer.

Cover and refrigerate for at least 4 to 6 hours until layers are set. Slice into squares and serve.