Classic French Silk Pie
["1 c. granulated sugar", "3/4 c. butter, softened *", "1 1/2 tsp. vanilla", "1/4 tsp. cream of tartar", "3 sq. (1 oz. each) unsweetened chocolate, melted and cooled", "3 eggs", "1 c. chilled whipping cream", "2 Tbsp. powdered sugar"]
["Bake pie shell; cool.", "Beat granulated sugar and butter in 1 1/2-quart bowl until light and fluffy.", "Stir in vanilla, cream of tartar and chocolate.", "Beat in eggs until light and fluffy, about 3 minutes.", "Pour into pie shell.", "Refrigerate until set, 3 to 4 hours.", "Or cover with plastic wrap and freeze at least 8 hours."]
["sugar", "butter", "vanilla", "cream of tartar", "unsweetened chocolate", "eggs", "chilled whipping cream", "powdered sugar"]