In a large bowl, mix together the egg, bread crumbs, parsley, onion powder, garlic powder, salt, pepper, thyme, ground beef, and ground sausage.
Form 8 patties and set them on a plate.
Heat a large skillet over medium to medium-high, then add the olive oil.
Brown the patties on both sides, but don't cook all the way through. Set them on a plate.
After browning the patties, remove excess grease and add the butter to the pan. Then add the onions and cook them until tender.
Place the patties in the crock, then add the onion over them. Add the mushrooms.
In a 4 cup measuring cup, add the beef consommé, wine, Worcestershire sauce, ketchup, and garlic. Whisk together well and pour over the meat in the crock.
Cook on High for 3-4 hours, or Low for 6-7 hours.
Whisk together the corn starch and water until dissolved. Stir into the gravy and replace the lid.
Cook on High until the gravy thickens.
Serve over mashed potatoes or rice.
