01 -
In a 6-quart slow cooker, arrange the sliced onion and mushrooms. Place the cube steak over the top of the vegetables, layering if necessary.
02 -
In a bowl, combine onion soup mix, cream of mushroom soup, water, black pepper, seasoned salt, and minced garlic. Whisk together until smooth.
03 -
Pour the soup mixture over the cube steak in the slow cooker. Cover and cook on high for 6 hours or on low for 8 hours.
04 -
In the last hour of cooking, whisk together the dissolved cornstarch and water. Stir the mixture into the slow cooker and cook on high for an additional 30 minutes to 1 hour, until the gravy thickens.
05 -
Serve hot over egg noodles, rice, or mashed potatoes.