In this masterpiece, we transform ground beef into tender and flavorful patties that rest perfectly on a bed of sliced mushrooms and onions. What truly makes this dish stand out is the smooth gravy, effortlessly created using a dry brown gravy mix, ketchup Dijon mustard and fresh parsley. As your slow cooker works its magic these savory flavors meld together over five hours to create a soul-warming meal for any occasion. Whether you choose to serve it over mashed potatoes or fluffy rice…