Combine the cream of chicken soup, French onion soup, au jus gravy mix and 1/2 cup water in a 6-quart slow cooker. Stir well. Put 4 cubed steaks into gravy mixture and make sure it is coated well. Cover slow cooker and cook steak on low for 6-8 hours.

To Thicken Gravy:
In a small bowl, whisk together the cornstarch and cold water. Stir mixture into crock pot. You do not need to remove the cubed steaks to do this. Turn the setting to high and cook for 30 minutes until gravy is thickened. Then serve and enjoy!