One 9-inch chocolate pudding pie.  
 
This might not be traditional for everyone, but it's the pie we make at home every year for Thanksgiving in my family.  My kids LOVE it and call it and it's absolutely the first to be finished.  We make a rich chocolate pudding and pile it high into a chocolate oreo crust.  Slightly sweetened whipped cream is optional, but goes a long way to break up all the chocolate.