Combine the sugar, water and butter in a medium size saucepan. Place the saucepan over high heat, stir and cook the ingredients until they come to a boil.Stir the corn syrup into the ingredients in the saucepan and reduce the heat to low. Simmer the ingredients for 1 - 2 minutes then remove the saucepan from the heat.Add the peanut butter, marshmallow creme and vanilla to the pan, stir the ingredients together until they are well combined. Refrigerate the Amish Peanut Butter Spread for 30 minutes or until thickened.