Slow Cooker Salisbury Steak with Mushroom Gravy Serves: 4 Ingredients:For the Patties: 1 lb ground beef 1 egg ¼ cup minced onion ¼ cup breadcrumbs 2 garlic cloves, minced Salt, pepper, thyme, rosemary For the Gravy: 1 sliced onion 8 oz sliced mushrooms 2 cups beef broth 1 packet brown gravy mix Ketchup, Dijon mustard, Worcestershire Cornstarch + water to...