To the slow cooker, add the cubed steak, onion soup mix, brown gravy mix, condensed mushroom soup, and pour the beef stock over everything.
Lightly mix and cook on HIGH for 4 hours or LOW for 6-7 hours.
Carefully stir and serve over desired side such as egg noodles, rice or mashed potatoes. Garnish with fresh parsley if desired. Enjoy!
Video
Notes
Some readers have asked if hamburger patties can be used, I think finding the cubed steak is important for this particular recipe. If you want to use ground beef, try my salisubry steak recipe.