1 stick soft butter
3/4 c. sugar
2 sq. melted unsweetened chocolate
1 tsp. vanilla
2 eggs

With electric mixer, cream butter and sugar. Add melted chocolate and vanilla - have mixer on high. Add 1 egg at a time and beat 5 minutes after each egg. Put in prepared pie crust and top with Cool Whip and grate a little unsweetened chocolate on top.