1 c. butter
1 1/2 c. sugar
2 sq. unsweetened chocolate, melted
2 tsp. vanilla
4 eggs, unbeaten
Baked 8 inch pie shell

Cream butter in mixing bowl at low speed. Gradually add sugar, creaming well. Blend in chocolate and vanilla. Add eggs, one at a time, beating 5 minutes after each. Spoon into pie shell. Chill 2 hours. Serve with whipped topping.