In a large bowl, combine the ground beef, egg, breadcrumbs, onion, tomato paste, Worcestershire sauce, Italian seasoning, salt, and pepper. Form the mixture into 4 equal sized, oval shaped patties.
1 pound ground beef, 1 large egg, 1/3 cup breadcrumbs, 1/4 cup white onion, 1 tablespoon tomato paste, 1 tablespoon Worcestershire sauce, 1 teaspoon Italian seasoning, 1/2 teaspoon kosher salt, 1/2 teaspoon ground black pepper
Heat the cooking oil in a large pan over medium heat. Cook the patties for 5 to 6 minutes on each side. Set the steaks aside on a plate.
1 tablespoon canola oil
In a large measuring cup or bowl, whisk together the cream of mushroom soup, au jus mix, brown gravy mix, broth, and dried thyme. Set aside.
10.5 ounces cream of mushroom soup, 1 ounce au jus mix, .87 ounce brown gravy mix, 1 1/2 cups beef broth, 3/4 teaspoon thyme
Assembly and Cooking
Layer half the sliced onions and mushrooms evenly over the bottom of the crockpot. Place the steak patties on top of the onions and mushrooms in an even layer. Next, top with the remaining onions and mushrooms. Last, pour the gravy mixture over everything.
8 ounces mushrooms, 1 cup white onion
Add the lid to the crockpot and refrain from opening the lid while the food cooks. Cook the Salisbury steaks on high for 2 ½ to 3 hours or low for 4 to 5 hours.
Serve the steak and gravy hot over mashed potatoes.
The calories listed are an approximation based the best available information and the ingredients listed. A serving size consists of one (4-ounce) Salisbury steak with about half cup of gravy. Actual calories will vary. leftovers can be stored in a sealed container, in your fridge, for about three days.*Doubling or tripling this recipe has not been tested. Therefore, we can not guarantee the outcome of adjusting the ingredients.**Notes**One small packet of brown gravy mix from your local store should be about one ounce. Use the whole packet. Due to the dry mixes and soup in the recipe, you may want to wait and add salt at the end of the cooking process. Otherwise, you might find the dish too salty.