French Silk Pie
["1 baked 9-inch pie shell", "1/2 c. butter", "1 1/4 c. powdered sugar", "1 1/2 sq. unsweetened baking chocolate", "1 tsp. vanilla", "2 eggs"]
["Cream butter and add sugar gradually, creaming well.", "Blend in melted and cooled chocolate, then vanilla.", "Add 1 egg at a time, beating for 5 minutes after each addition.", "Turn into pie shell. Chill 1 to 2 hours.", "May be topped with whipped cream and nuts, if desired."]
["shell", "butter", "powdered sugar", "chocolate", "vanilla", "eggs"]