Slow Cooker Salisbury Steak is comfort food at its best...scrumptious beef patty smothered in a deliciously rich mushroom and onion gravy. All cooked to perfection in the slow cooker!
In a bowl, combine Patty mixture and form 6 patties. Brown in a skillet or slow cooker if it has a saute feature. Remove beef patties and set aside.
In a bowl combine gravy mixture ingredients.
Layer mushrooms and onion slices on the bottom of the slow cooker. Pour gravy mixture over the mushrooms and onions. Then add patties to the top and move around until coated in gravy.
Place on lid. Set to high for 4 hours.
After cooking is complete. Mix slurry mixture. Move patties to one side of slow cooker. Pour in slurry and stir around to thicken. Move patties back into gravy and stir to coat with gravy. Serve.