Contessa: That is the BEST pot roast recipe ever. Been making it for over 30years.
If you don't have a crock pot, take a large oven roaster pan. Lay a very long sheet of heavy duty tin foil in it. Put the meat in first, then pour the cream of mushroom soup and the dried onion soup over it. (If I use a very large piece of meat, or 2 pieces, I use 2 cans of soup. One regular and one golden mushroom.) I also put frozen pearl onions and frozen or fresh baby carrots in.
Fold the tin foil up and seal tightly on top and 2 sides. Bake at 325 for 4 hours. When done, remove everything from the tin foil and pour the juice/sauce into the roaster (be sure to scrap the bottom of the foil to get all the good stuff out), mix a little flour or cornstarch and water and add to the sauce, cook over a medium heat to thicken the sauce. Serve over noodles or rice pilaf.
ps, if you LIKE mushrooms you can also add sliced fresh or canned mushrooms to the tin foil packet.