Make two pie crusts or use pre-made pie crusts and cook according to directions.
In a saucepan, bring to a boil the sugar, milk, and butter.
In a large bowl, combine the eggs, evaporated milk, cornstarch, flour, and vanilla.
After the ingredients in the saucepan begin to boil, add the ingredients from the bowl and cook until it thickens. Note: MIXTURE WILL BE LUMPY!! When thickened, remove from heat and beat until smooth. (You can use a blender to mix with, though I usually use a whisk.)
Pour into the baked pie crust shells and cool in the refrigerator for about 2 hours. Top with either real whipping cream or Cool Whip. You can garnish the pies with shaved chocolate.