In a bowl, mix 1 tablespoons butter, hamburger, onion, bread crumbs, steak seasoning and 1/4 can of the mushroom soup.
Divide and shape into 8 patties. Use medium to medium high heat and brown for 2 minutes on each side in a skillet. Remove patties to a plate.
To the skillet, add 1 tablespoons butter and cognac. Using your spoon, scrape all of the goodies off from the bottom as you stir. Add mushrooms and saute for a minute or so. Add beef broth, gravy mix and remaining mushroom soup. Whisk together bringing to a boil. Put steaks back in and let simmer 20-25 minutes.