In a large no-stick skillet, begin heating the milk, butter and chicken stock over medium heat. Whisk in the flour right away , eliminating all lumps, as it comes to a boil., it should thicken. Add the salt and pepper. As it thickens, toss in the chopped turkey and stir carefully as to not break up the chunks to much. If it gets to thick just add some milk and stir. As soon as the mix is thick enough to your liking , it is done. Turn off the heat and cover until serving. Serve over biscuits or toast.