Cook the beef in a heavy skillet, adding a small amount of butter if necessary, until slightly browned, breaking it up with a fork as it cooks; set aside. Cook the onions and green pepper in 2 tablespoons of butter until soft. Add the mushrooms and saute' for 5 minutes, covered. Add the meat and cook for 5 minutes more. Add the bouillon and heat to boiling. Meanwhile mix the flour with the water into a smooth paste and add this to skillet when the contents are boiling. Stir in the seasonings and simmer for 15 minutes, stirring occasionally. Add the noodles and heat. Makes 6 servings.