Chocolate Pie
["2 Tbsp. cocoa or 1 Tbsp. cocoa for milk chocolate", "2 1/2 Tbsp. cornstarch", "1 c. sugar", "2 egg yolks", "1 1/2 tsp. vanilla", "1/2 stick margarine", "1 1/2 to 2 c. milk", "1 pie shell, already baked"]
["In a saucepan, combine all dry ingredients.", "Add egg yolks, vanilla, margarine and milk.", "Cook on medium heat until it comes to a boil.", "Pour into baked pie shell.", "Top with meringue, if desired.", "Bake at 400\u00b0 until meringue is browned."]
["cocoa", "cornstarch", "sugar", "egg yolks", "vanilla", "margarine", "milk", "pie shell"]