ground beef, turkey or leftover roast beef Egg noodles, prepared as pkg. sour cream 1 can cream of mushroom soup 1 lg. garlic powder 1/2 tsp. Add the onion slices and mushrooms to the pan drippings. Sprinkle with 1 teaspoon flour. Put the steak back into the pan with the onion and mushrooms. directs Salt & pepper 2 tbsp. Sauté for a few minutes, until the onion is tender. Hearty casseroles are a must, and this French onion ground beef stroganoff casserole is going to be a new regular meal at our house. I have taken all the suggestions and advice from all the reviews and created this: INGREDIENTS 2 pound cubed jar mushrooms, drained flour 1/2 c. milk 1 sm. Several people reviewing this recipe on this website said it was bland so instead of using chopped onion I used one envelope of Lipton Recipe Secrets Beefy Onion dried soup mix added 1/2 cup of milk to thin the stroganoff out 1 can of mushrooms drained and used 1/2 cup each of fat free sour cream and regular sour cream. French onion ground beef stroganoff casserole is an easy and hearty casserole filled with hamburger, onions, sour cream, cream of mushroom soup, noodles, and crispy fried onions great for a busy weeknight dinner. paprika 1/2 pt. Cook over low heat for about 30 minutes, covered. Add the cream of mushroom soup and beef broth. 1/2 c. chopped onion 1/4 tsp.