I found this on facebook and tried it...OMG it's absolutely the best pot roast I have ever had.
1 4 or 5# boneless chuck roast
1 pkg. dry onion soup mix
1 pkg. dry Hidden Valley Ranch dressing mix
1 pkg. dry Au Jus mix
1 cup beef broth
Mix all dry mixes in the one cup of broth until all dissolved. Put roast in crockpot, pour broth mixture over. Set crockpot on low for 8 hours.
That's it...couldn't be easier. I served mashed potatoes and steamed broccoli with it. The gravy from the pot is great over the potatoes.