This is how we make it in the Chidester household. Please comment on how your recipe differs.
1 4-5 lb roast
1 can cream of mushroom soup
1 can cream of mushroom soup with garlic
2 envelopes beefy onion soup mix
1-2 lb baby carrots
1 large onion
8 oz mushrooms, quartered
about 1 c water
Put the roast in your crock pot.
Add the vegetables.
Top it with the soups and water.
Cook on low for 6 hours, or until done.
We make ours with mashed potatoes instead of cooking them in the crock, because there is never enough room for them. I just got a bigger crock, but I'll probably still mash because I can never get the potatoes to cook all the way through.
According to my crock pot cookbook, you shouldn't take the lid off while your meal is cooking.
Also, you're only supposed to fill you crock pot 2/3 of the way because that's how high the heating coils go. (I always fill to brimming, and my food cooks just fine.)