1/2 c. butter
3/4 c. sugar
2 sq. melted unsweetened chocolate, cooled
2 eggs
2 c. Cool Whip
9 inch pie shell, baked and cooled

Cream butter and sugar. Stir in chocolate. Add eggs, one at a time, beating at high speed for 5 minutes after each addition. Fold in Cool Whip. Pour into pie shell and chill until firm.