1 (9 inch) cooked and cooled pie crust (either regular or chocolate)
1 c. butter
1 1/2 c. sugar
4 eggs
4 sq. unsweetened chocolate (melted)
2 tsp. vanilla

Cream butter and sugar for 5 minutes. Add cooled chocolate and vanilla. Beat for 5 minutes. Add eggs one at a time. Beat 5 minutes after each egg.

Pour into prepared pie crust and refrigerate for at least 3-4 hours. Garnish with whipped cream or Cool Whip and chocolate shavings.