Preparing the Steak

1. Season the Steak: Lay the cube steaks on a cutting board and sprinkle both sides with meat tenderizer, garlic powder, and onion powder.
2. Optional Browning: If desired, quickly sear the cube steaks in a large skillet with olive oil over medium-high heat, just enough to brown each side.

Making the Gravy Mixture

1. Combine Ingredients: In a small bowl, whisk together the cream of mushroom soup, onion soup mix, beef broth, and the envelope of brown gravy mix until well combined.
2. Add Mushrooms: If using, fold in sliced fresh mushrooms into the gravy mixture for added texture and flavor.

Slow Cooking

1. Layer the Steaks: Place the seasoned cube steaks in the slow cooker.
2. Pour Over Gravy: Cover the steaks with the gravy mixture, ensuring each steak is well-coated.
3. Cook: Set your slow cooker on low and cook for 4-6 hours until the steaks are tender and the gravy has thickened.