Chocolate Pie
["1 1/2 c. sugar", "3 eggs", "3 c. milk", "1/2 c. cocoa", "1/2 c. flour", "1/2 stick butter", "1 Tbsp. vanilla", "2 cooked pie shells (I like graham cracker crusts)", "Cool Whip"]
["Mix well all ingredients, except butter and pie shells and Cool Whip, in a saucepan.", "Add the butter last and cook over medium heat until thick, stirring constantly."]
["sugar", "eggs", "milk", "cocoa", "flour", "butter", "vanilla", "graham cracker crusts"]