1/4 lb. butter, softened
3/4 cup sugar
1 sq. unsweetened chocolate
1 tsp. vanilla
2 chilled eggs
Cool Whip or shaved chocolate (optional)

Mix butter, sugar, unsweetened chocolate and vanilla. Add eggs, one at a time, beating 2 minutes after each egg. Put in baked pie shell. Chill 2-3 hours before serving. Add Cool Whip or shaved chocolate, if desired.