01 -
Spray a large, 6-quart oval slow cooker with cooking spray. Then add the sliced mushrooms and onions to the bottom.
02 -
Next, prepare the ground beef mixture. Combine the ground beef, steak seasoning, 1 tablespoon of Worcestershire sauce, dried onion flakes, parsley, breadcrumbs and egg together. Mix well.
03 -
Divide the mixture into 4-6 patties. Form each patty into an oval shape, pressing thin, and then place in the slow cooker. (Make sure you spread evenly in the slow cooker and do not stack.)
04 -
Mix together the 2 cups of beef broth, 2-tablespoons Worchester sauce, 2 tablespoons cornstarch, and black pepper. Whisk until smooth then pour on top of beef patties. Place the lid on the slow cooker and cook for 4 hours on high.
05 -
Once the Salisbury steak is done cooking, remove the steaks from the slow cooker.
06 -
In a small bowl, add one-tablespoon cornstarch with 2 tablespoons water. Stir the cornstarch water mixture into the gravy in the slow cooker. Mix until thickened.
07 -
Serve each Salisbury steak with mushroom and onion gravy on top of egg noodles or mashed potatoes. Enjoy!