Pour the cream of mushroom soup, beef broth, onion soup mix, gravy mix, and seasonings into the bottom of the crockpot or slow cooker. Stir to combine.
Add the cubed steak into the crockpot and lay them out flat.
Pour some of the gravy on top of the steaks. Top with sliced mushrooms if desired.
Cover with the lid and cook on low for 6-8 hours, or high for 3-4 hours, until the cube steaks are tender.
Once the cube steak is done cooking, garnish with fresh chopped parsley.
Serve over egg noodles, white rice, or mashed potatoes, and also a side of steamed veggies. Enjoy!