In a medium bowl, whisk together milk, vanilla extract and vanilla pudding. Chill in the refrigerator for 10 minutes for pudding to solidify.
While pudding is chilling, make “dirt” by crushing Oreos in food processor until they are the consistency of potting soil.
In a separate bowl, cream together butter and cream cheese until smooth. Add powdered sugar to the mixture and beat until smooth.
Fold pudding and Cool Whip together, and then fold the combined pudding and Cool Whip into the butter and cream cheese mixture to create the pudding portion of the dirt cake.
Alternate layers of the pudding mixture and cookie “dirt” in serving dishes. Repeat layers until serving dishes are full.
Refrigerate 12 hours or overnight.
When ready to serve, add Easter sprinkles on top, if using.
Serve cold.