In a large non-stick skillet, brown meat and onion slices. Add sea salt and pepper. Stir occasionally to break up the meat into small pieces. Saute for a few minutes, until the onion is tender. Add mushrooms. Sprinkle with 1 teaspoon flour.
Add the mushroom soup and beef broth. Cook over medium heat until sauce thickens.
In the last few minutes before serving, gently mix in the sour cream. Add sea salt and pepper to taste. Serve over cooked noodles. Voila!