Slow Cooker Cube Steak creates it's own creamy mushroom gravy as it cooks in the crock pot! You'll need pantry items to make this recipe; cream of mushroom soup, onion soup mix, milk, and cubed steaks. They are falling apart, for tender after cooking in the crockpot! Cubed steak and gravy is a hearty meal that takes less than 30 minutes to prepare!