Velvety Cocoa Cream Pie
["3 c. milk", "1/2 c. minus 1 Tbsp. cocoa", "1 1/4 c. sugar", "4 1/2 Tbsp. cornstarch", "3 Tbsp. butter or margarine", "1 1/2 tsp. vanilla", "1 (9-inch) pie shell, baked", "1 c. whipped cream"]
["Mix all ingredients.", "Boil until thick.", "Pour into pie shell. Top with whipped cream."]
["milk", "cocoa", "sugar", "cornstarch", "butter", "vanilla", "pie shell", "whipped cream"]