cream of mushroom soup
onion, finely chopped
In a bowl, mix thoroughly 1/4 cup soup, beef, bread crumbs, egg and onion.
Shape firmly into 6 patties.
In a skillet over medium-high heat, cook patties, a few at a time, until browned on both sides.
Stir in the remaining soup and mushrooms; return patties to skillet.
Cover; simmer 20 minutes, or until done, turning patties occasionally.