I made this pot roast recipe yesterday, and it turned out to be the best slow cooker pot roast to date. Even the gravy was really good.
1 can cream of mushroom soup (I used low-sodium kind)
2 c. beef broth (either homemade or low-sodium)
1 package onion soup mix (Liptons)
1 pot roast (the roast I used was partially frozen, which is better if you're going to be cooking this a long time)
Mix soup, broth, onion soup in a bowl. Put roast in slow cooker, pour soup mixture on top. Cook at 6-8 hours, until roast is done. Take roast out, mix 2 Tbsp. cornstarch with 2 Tbsp. water and then add that to gravy in slow cooker, turn up to high. Cook about 5 min, so sauce thickens.
Easy as can be. The house smelled good when I walked in the door from work, and all I had to do was make some rice and roast some veggies. Good as leftovers, too.