1. For Peanut-Butter Filling, beat cream cheese, sugar, peanut butter, butter, and vanilla in a large mixer bowl, until creamy. Gently fold in half the beaten cream, then fold in remaining cream until blended. Spread filling in crust; smooth top.
2. For topping, combine chocolate pieces and coffee in a microwave proof bowl. Cover with plastic wrap. Microwave on High 1-1/2 to 2 minutes; stir until smooth. Cool chocolate slightly, then pour over top of filling. Refrigerate pie 1 hour until chocolate is firm, then cover loosely with plastic wrap and refrigerate overnight. Sprinkle with chopped peanuts, if desired.