Heat oven to 350 degrees F (175C) and coat the baking dish with butter or non-stick spray.
Combine the ground beef and dry onion soup mix in a bowl. Fold to combine until beef is evenly coated, avoiding excessive mixing/handling.
Form into 7 even patties and flatten each into a thin oval. Even out the thickness of each patty and lay in a single layer in the baking dish.
Whisk together the remaining ingredients for the gravy (soup, milk, Worcestershire sauce and thyme).
Evenly distribute over the top of the beef patties.
Cover tightly with foil and bake for 35 minutes.
Uncover and bake for a further 10 minutes, or until the gravy is bubbly/thickened around the perimeter and patties register 160 degrees F. Rest for 5 minutes and spoon over additional gravy to serve.
*Nutritional information is a calculated guesstimate. Please note that this can change with different brands and modifications you may make to the recipe. For the most accurate information, use a nutritional calculator with the exact brands and measurements you're using with each recipe.