Salisbury Steak - Jo Cooks

Ingredients

• 2 pound ground beef (extra lean)
• ½ cup breadcrumbs
• 1 large egg
• ½ teaspoon Worcestershire sauce
• ½ teaspoon salt
• ½ teaspoon pepper
• 1 tablespoon olive oil
• 1 tablespoon butter
• 1 large onion (halved and sliced thinly)
• 8 ounce cremini mushrooms (optional)
• 2 cups beef broth (low sodium)
• 1 tablespoon tomato paste
• 1 tablespoon soy sauce
• 1 teaspoon Worcestershire sauce
• 2 teaspoon cornstarch
• ¼ teaspoon salt (or to taste)
• ¼ teaspoon pepper (or to taste)