Sprinkle the flour over the mushrooms and stir in the last tablespoon of butter. Mix the flour into the mushrooms well. Next, add the chicken broth and simmer slowly until slightly thickened. Then add the turkey.
Remove the pan from the heat and stir in the sour cream and drained noodles. Mix well to coat the noodles with the sauce. Sprinkle each plate with a pinch of parsley.