In a large bowl, mix all the ingredients together. Shape the patties into the desired size. Set the patties aside on a plate. In a large nonstick skillet, cook the meat on medium-high heat. Continue cooking the meat until the meat is lightly brown on both sides. Transfer the meat to a plate.
Prepare the slurry by combining the starch together with the water. Set it aside. Lower the heat, using the same skillet with the drippings, add the butter, and when the butter has melted, add the onions and mushrooms, then add the garlic; stir. Add in the seasonings and parsley. Add the Worcestershire sauce, water, and slowly while stirring or whisking add the slurry. Mix well until lumps are no longer visible. Then add the meat.
Spoon the gravy over the meat. Cover and cook until cooked through. Remove the skillet from the heat. Enjoy mashed potatoes, sweet peas, potato salad, or roasted carrots.