In a large skillet, over medium heat, add the diced onions and saute until golden, about 4 minutes. Remove onions and set aside. Remove pan from heat.
In a large bowl, combine the ground sirloin, sauteed onion, whole wheat bread crumbs, egg, low-sodium ketchup, Dijon mustard, Worcestershire sauce, salt and pepper.
Form the beef mixture into oval shaped loaves. Set aside.
Reheat the large skillet over medium heat, spray with cooking spray. Sear the salisbury steaks on both sides, interior will no longer be pink. Remove from the heat and set steaks aside.
To make the Gravy
In a large skillet, over medium heat, add 1 teaspoon olive oil. Saute diced onion until golden brown, about 3 minutes. Add in minced garlic and saute another minute.
Add in the beef stock, low-sodium ketchup, Dijon mustard, Worcestershire sauce, salt and pepper, to taste.
In a small bowl, combine the cornstarch with some of the beef broth mixture until smooth and no clumps of cornstarch. Add back into the beef stock mixture.
Raise the heat on the pan to medium high and bring the gravy to a low boil.
Reduce heat to low.
Place the salisbury steaks into the skillet. Let simmer about 5-10 minutes.
Check seasoning and adjust salt and pepper if needed. Serve over mashed potatoes, mashed cauliflower or egg noodles.
Notes
The salisbury steaks are between 3-4 ounces before being cooked.
Low-sodium ingredients are what we use but regular ketchup and beef broth can be used.
Be sure not to overwork the meat when forming patties.
Any nutritional value used is an estimate. These figures can change based on ingredients and portion size